PreAP Biology - BIOLOGY JUNCTION

Mastering GCSE Biology: Key Concepts Every Student Should Know

Biology is a key subject in the UK’s secondary school curriculum, covering essential topics that form the foundation for further study in science. Whether preparing for exams or aiming to improve understanding, many pupils seek additional support to strengthen their grasp of complex topics. While schools provide structured lessons, some individuals find that extra guidance enhances their confidence and knowledge.

With a well-organised approach and access to expert advice, learners can easily tackle challenging areas. Many resources are available to help clarify difficult concepts, offering structured revision techniques that align with national exam boards.

Here’s how you can stay on top of your biology exam prep:

Understanding the GCSE Biology Syllabus

The curriculum in the UK is designed to develop a strong foundation in scientific principles, ensuring that pupils acquire theoretical and practical knowledge. Different exam boards, including AQA, Edexcel, and OCR, structure their content to assess various skills, from knowledge recall to critical thinking.

Key areas of study include cell structure, human body systems, genetics, ecology, and practical investigations. Laboratory work plays a significant role in helping individuals understand real-world applications of biological processes. Developing a systematic revision plan that covers all core topics can help improve recall and confidence when answering exam questions.

Expert Support for GCSE Biology Pupils

Many learners benefit from additional academic guidance outside the classroom. If you’re looking for specialised biology tutoring UK has several digital platforms with experienced teachers who provide tailored assistance and help individuals refine their understanding of difficult concepts.

Structured sessions focus on key subject areas, offering in-depth explanations and exam techniques to boost performance. Various study formats, including flexible lesson schedules, allow participants to fit extra practice into their routines. With expert input, learners can develop effective strategies for problem-solving and gain a deeper appreciation of scientific ideas.

Cell Biology: The Foundation of Life

Cells are the basic units of life, forming the building blocks of all living organisms. Understanding how they function is crucial to grasping more advanced biological concepts.

There are two primary cell types: prokaryotic and eukaryotic. Prokaryotic cells, found in bacteria, lack a nucleus, while eukaryotic cells, present in plants and animals, contain a nucleus and other specialised structures.

Key cellular functions include respiration, protein synthesis, and reproduction. Mitosis and meiosis are essential processes that enable growth, repair, and genetic variation. Mastering these principles is vital for tackling the topics of genetics, physiology, and ecology later in the syllabus.

Human Body Systems and Their Functions

The human body consists of interconnected systems that work together to maintain overall health. Each system has a specific role, ensuring that essential functions such as respiration, digestion, and circulation operate efficiently.

The circulatory system transports oxygen and nutrients to cells, while the respiratory system facilitates gas exchange. The digestive system processes food, breaking it down into absorbable components, and the nervous system transmits signals between the brain and body.

Understanding how these systems interact provides insight into human physiology and medical advancements. Recognising the importance of lifestyle choices, including a balanced diet and regular exercise, can also enhance knowledge of health and disease prevention.

Genetics and Evolution: Understanding Heredity

Genetics explains how traits are passed from one generation to the next. DNA, the molecule carrying genetic information, plays a fundamental role in inheritance, influencing characteristics such as eye colour and height.

Gregor Mendel’s work on pea plants laid the foundation for modern genetics, demonstrating how dominant and recessive traits are inherited. Understanding Punnett squares and genetic probability helps explain patterns of inheritance.

Evolution, driven by natural selection, shapes the diversity of life. Organisms with advantageous traits are more likely to survive and reproduce, passing on beneficial characteristics to future generations. Studying these principles helps explain biodiversity, adaptation, and species survival over time.

Ecology and the Environment

The natural world is made up of interconnected ecosystems, where organisms depend on each other and their surroundings for survival. Understanding ecological relationships helps explain how species coexist and adapt to environmental changes.

Biodiversity plays a key role in maintaining balance within ecosystems. When habitats are disturbed due to deforestation, pollution, or climate change, species struggle to survive, leading to population declines and ecosystem instability. Conservation efforts aim to protect endangered species and restore damaged environments.

Human activity has a direct impact on the planet, influencing air and water quality, weather patterns, and resource availability. Learning about sustainability, recycling, and conservation measures can help individuals make informed choices that reduce environmental harm.

Photosynthesis and Respiration

Plants use photosynthesis to convert sunlight into energy, providing the foundation for life on Earth. This process takes place in chloroplasts, where carbon dioxide and water, in the presence of light, produce glucose and oxygen.

Respiration, on the other hand, allows organisms to release energy stored in food. Aerobic respiration requires oxygen and occurs in cells to produce energy for movement, growth, and repair. Anaerobic respiration, which happens when oxygen is scarce, provides a short-term energy source but also leads to the production of lactic acid in animals.

Both processes are essential for survival. Photosynthesis supports life by generating oxygen and food, while respiration ensures energy is available for essential biological functions.

Homeostasis and Response

The body maintains a stable internal environment through homeostasis. This regulation is essential for processes such as temperature control, blood sugar regulation, and hydration balance.

The nervous system and endocrine system work together to respond to changes in the body. For example, the brain detects fluctuations in temperature and signals the skin to adjust accordingly. The pancreas regulates glucose levels by releasing insulin and glucagon as needed.

Reflex actions, such as pulling away from a hot surface, demonstrate how the nervous system reacts quickly to external stimuli. Understanding these mechanisms helps explain how the body adapts to different conditions and maintains overall stability.

Understanding biology at this level provides a strong foundation for further study in science and related fields. By developing knowledge of key topics, practical skills, and exam techniques, learners can approach assessments with greater confidence.

With the right study strategies and support, complex topics become more manageable. Engaging with the subject beyond textbooks through experiments, discussions, and real-world applications can also deepen understanding.

A well-rounded approach to science education not only prepares pupils for exams but also helps them develop critical thinking skills that are valuable for the future.

Is AP Biology a Hard Class? Tips and Insights to Help You Succeed

Advanced Placement (AP) Biology is a course that challenges high school students with college-level material. While many find it demanding, it’s also incredibly rewarding for those interested in science and biology-related fields. With the right approach, you can navigate the course’s challenges and achieve success. The skills and knowledge gained from AP Biology can also provide a solid foundation for future academic and career pursuits. Here’s everything you need to know about AP Biology, including whether it’s hard and how to succeed.

What Is AP Biology?

AP Biology is a college-level biology course offered in high school, designed to provide a deeper understanding of biological concepts.

What do you learn in AP Biology? Students delve into topics such as evolution, cellular processes, genetics, ecology, and the interactions between organisms and their environments.

This course includes hands-on lab experiments, which are vital for grasping the concepts discussed in class. These labs encourage critical thinking and problem-solving skills, allowing students to approach biological challenges like scientists.

Labs range from examining cell structures to studying ecosystems, helping students connect theory to real-world biology.

Who Should Take AP Biology?

AP Biology is ideal for students who:

● Are genuinely interested in exploring science and biology.

● Are considering a career in health, medicine, or research.

● Feel comfortable with challenging coursework and independent study.

Choosing to take AP Biology is a big step, and it’s natural to wonder if it’s the right fit for you. Instead of overthinking, ask yourself, “Can you write me an essay explaining why I’m excited to take this course?” If the answer highlights your passion for science and eagerness to learn, AP Biology could be the perfect opportunity to grow academically and earn college credits.

Understanding the Difficulty of AP Biology

Is AP Biology hard? Many consider AP Biology one of the toughest AP courses due to its demanding curriculum and in-depth topics. However, the difficulty depends on your background, study habits, and dedication.

Exam Focus and Demands

The AP Biology exam is comprehensive, requiring a strong grasp of numerous biological concepts. It includes multiple-choice questions, grid-in calculations, and free-response essays. You’ll need to analyze experimental data, interpret results, and apply your knowledge to unfamiliar scenarios.

How long is the AP Biology exam? The exam lasts 3 hours, testing your ability to think critically and synthesize information quickly. With its breadth of content and time constraints, it’s no wonder some students ask, “Is the AP Biology exam hard?” Understanding how to study for AP Biology exam effectively is key to managing its demands and improving your performance. Proper preparation can significantly enhance your chances of success.

How to Succeed in AP Biology

Success in AP Biology requires consistent effort, effective study habits, and active engagement in class. Try these practical tips to boost your performance.

Develop Strong Study Habits

Strong study habits are essential to succeed in AP Biology. Here’s how to study for AP Biology:

● Start early: Begin reviewing notes and concepts as soon as the course starts. Cramming the week before the exam won’t work for a course of this depth. Consistency is key, so make studying a regular part of your routine.

● Use resources: Leverage textbooks, online tools, and AP Biology prep books to reinforce your understanding. Don’t hesitate to explore videos or interactive platforms that explain complex topics in a more visual way.

● Practice exams: Get comfortable with the structure and question types featured in the AP Biology exam. Practice regularly to build confidence. Review your mistakes thoroughly to identify areas that need improvement.

Make the Most of Class Time

Maximizing your class time is one of the best ways to grasp difficult material. Here’s how:

● Participate actively: Participate actively by asking questions, joining discussions, and clarifying difficult concepts. Engaging in class helps you retain information and demonstrates your commitment to learning.

● Stay organized: Keep a dedicated notebook for notes, diagrams, and important terms. This will be your go-to resource during exam prep. Adding color coding or tabs can make finding key information quicker and more efficient.

● Collaborate with peers: Study groups can help you learn from others and fill in gaps in your understanding. Working with classmates also gives you the opportunity to explain concepts, which reinforces your own learning. With these strategies, you’ll have a strong foundation and know how to study for AP Biology effectively.

Is AP Biology Worth Taking?

So, is AP Biology worth it? The answer depends on your goals.

If you’re passionate about science and considering a career in biology, medicine, or environmental studies, AP Biology can give you a significant head start. The skills and knowledge you gain in this course can also strengthen your college applications, showcasing your academic commitment.

The course not only helps you develop critical thinking skills but can also earn you college credits, saving time and money later.

Even if science isn’t your career focus, AP Biology provides a valuable understanding of the natural world, which can be beneficial in any field. Plus, it can give you a deeper appreciation for the scientific processes that impact everyday life.

The time and effort you dedicate to this course can create opportunities and sharpen your academic abilities.

Conclusion: Just How Hard Is AP Biology?

So, is AP Biology a hard class? The answer depends on your preparedness and mindset.

While it’s undoubtedly a challenging course, it’s also incredibly rewarding for students who approach it with dedication and the right strategies. The sense of accomplishment you’ll feel after tackling such a demanding course is well worth the effort.

By focusing on consistent study habits, making the most of class time, and leveraging available resources, you can overcome the hurdles and succeed. Success in AP Biology can boost your confidence in handling future academic challenges.

Whether your goal is to earn college credits, prepare for a science-related career, or simply explore your passion for biology, AP Biology is a worthwhile challenge that can set you up for future success.

What You Need to Know About Becoming a Biology Major

People choose to major in Biology for reasons that go beyond a fascination with living organisms. So, what’s so special about that? In essence, it satisfies a deep curiosity about life and answers fundamental questions about the natural world. And, that’s not it. On top of that, many are motivated by a desire to make a meaningful impact. There are various ways to do that, whether through medicine, conservation, or research. However, this field is very complicated. Thanks to its challenges, people can experience a sense of accomplishment. At the end of the day, mastering complex topics fosters resilience and growth. But the question is “How to handle those challenges successfully?” Read a simple answer below.

Handling Challenges in Education

What is a Biology major path? To be fair enough, the academic journey is as demanding as it is rewarding. If you want to become a Biology major, you must understand that this path will be filled with challenging courses and rigorous research projects. And of course, this overwhelming workload can lead to intense reactions to stress. So, if you don’t want to face the negative consequences of that, you should learn how to balance work, exams, and writing assignments. The best way to do that is by using additional support. For me personally, the best solution was to pay someone to write my essay so that I could submit it on time without sacrificing sleep. Thanks to Edubirdie which provides online academic assistance, I could keep my passion for Biology alive and manage all my responsibilities. But it’s far not everything that you must know. Read more about this educational journey below.

Confronting the Boundaries of Control

If you think about what lessons biology teaches us, it would be a lot about control. It shows us that life is governed by forces beyond our control, such as evolution, genetic inheritance, and ecological interactions. Sometimes, it can feel frustrating but it’s better to learn this lesson as soon as possible. While pursuing a major in Biology, many young people come up against the limits of human influence and are reminded of the fragility that underlies all living systems. Of course, this can evoke discomfort, but it’s worth facing. This is a necessary confrontation with reality that forces a deeper recognition of what it means to be alive. It forces a deeper recognition of what it means to be alive, so we can keep our hearts soft and open.

Searching for Meaning in Complexity

Any Biology student would confirm that the allure of this science lies not in its simplicity but in its intricacy. To be more accurate, the field doesn’t shy away from the messiness of life; rather, it delves into it. Researchers bravely accept the challenges presented by this field and delve into the messiness of life. They dedicate huge amounts of time to examining the interconnections between organisms and their environments. They also explore the emergence of consciousness, and the process of decay and renewal, which are so exciting for curious minds. By the way, have you ever thought that there is often an underlying need to find meaning amid this complexity for those drawn to this major? Just reflect on that and you’ll notice how you not just seek answers but strive for understanding your place in a world where change is the only constant. Thus, Biology becomes a way of coming to terms with the ever-changing nature of life.

Growth Through Tension and Struggle

If you study Biology, you must be prepared for the fact that this path is fraught with challenges. Just imagine yourself in a laboratory and recall all the failed experiments, difficult concepts, and unexpected outcomes. Sounds pretty scary, isn’t it? Yet, these struggles are not just obstacles to overcome. If we look at them from another perspective, they are the very ground upon which growth takes place. Without setbacks, we wouldn’t progress that much. In general, each setback invites reflection and each obstacle demands adaptation. This is an exciting ongoing process where you come to realize that growth is forged through moments of tension. It’s a valuable life lesson that Biology can teach you. Hence, the pursuit of understanding biology, then, is a lived experience of questioning and reimagining what is possible.

Final Thoughts

So, is biology hard? Definitely, yes. But it should not scare you away. If you pick a Biology program, you will not regret it. In fact, you need to know about both rewards and challenges before applying for a major in Biology. Hopefully, this article has inspired you to follow your passion!

Author’s BIO

Mattew Stoll is a personal tutor and content writer. He works with high school graduates and college students to help them achieve outstanding results in their education. Matthew believes that we all need to explore our full potential in academic settings, so his mission is to help with that.

Conquering Your Biology Paper Starts with Smart Preparation

When you sit down to write a biology paper, it can be scary. So many science terms, so much research, so many expectations. But it doesn’t have to be that hard. If you start with smart preparation, you’ll find that the writing process goes a lot more smoothly, and you’ll feel more confident writing about the most challenging subjects. Let’s break it down into easy steps to ace your Biology paper.

Writing Biology Papers

1. Choose a Focused Topic

A good first step in smart prep is to select a topic that’s relatively narrow and manageable. The subject of Biology is so vast that to succeed, you’ll have to narrow your focus. Your topic will be too broad if you don’t know where to start your search and don’t know when you’ve covered enough. You can overcome these problems by zeroing in on a specific question or issue. For example, instead of “The Human Immune System”, consider “The Role of T-Cells in Fighting Viral Infections”. A narrow topic makes it easier to stay on track and allows you to go deeper in your research.

2. Conduct Thorough Research

Now you have chosen your topic, it is time to get down to business – research! For any good biology paper, your sources always need to be robust. That means peer-reviewed journal articles, books, and academic websites. Be sure to organize your research as you go. Keep a notebook or digital document handy for saving quotations, studies, and other facts that you plan to use in your paper. This will help you avoid a frantic search once you’re ready to put pen to paper.

3. Develop a Clear Thesis Statement

Your biology paper thesis needs to be clear. If your thesis is strong, it will set the direction of your Biology paper while allowing you to focus on the points that you want to make. If we continue with our previous example, a thesis for a biology paper on T-cells could be like this: “T-cells are important because they identify and eliminate infected cells that are infected by viruses, thus preventing the spread of infections”. Your thesis should be concise, specific, and backed by the research you’ve conducted.

4. Create an Outline

An organized outline is perhaps the single most important thing to do when preparing for any paper. Use your outline to map out the order of your essay’s thoughts and arguments so that your ideas flow in a logical manner.

5. Use Visuals to Support Your Argument

Biology papers often grapple with concepts and processes that are hard to describe with words alone. Charts, diagrams, and graphs can help you explain scientific ideas more effectively and make your paper more inviting to read. For instance, if you’re writing about cell division, an easy-to-understand diagram of mitosis can make your explanation easier to follow. Don’t forget to label any visuals you add.

6. Break the Writing Into Sections

Don’t try to write the whole paper simultaneously, as that will leave you frustrated and exhausted. Instead, break up the writing into chunks. Write a paragraph. Or one section. Get that part done well, and then go to the next part of your paper. Having mini-goals makes it less overwhelming and will help you pay equal attention to each part of your paper.

7. Consider Using Essay Writers for Hire

If you have multiple assignments and deadlines to meet, you can get easily stuck and not know what to write first. Or maybe the topic you were assigned is too broad or complex to handle in a given time. In that case, there are services that can help you with this task. Essay writers for hire can help you create a well-researched and well-structured biology paper. This will leave you with some free time for your other projects.

8. Proofread and Edit Your Work

After you have completed your paper, you might be tempted to hit ‘submit’ and call it a day, but take the time to proofread and edit your paper. Your paper should be free of spelling, grammar, and punctuation mistakes, and all of your ideas should flow seamlessly from one section to the next. If you can, you should reread your work after a break with a fresh set of eyes. You may see what you initially didn’t notice.

9. Cite Your Sources Properly

Biology papers rely on a substantial amount of external sources, and they need to be cited properly. Cite the sources using whatever citation style your professor asks for – APA, MLA, or Chicago. Using the correct citation rules gives your work more credibility. If you’re not sure how to cite a source, numerous online tools, such as Citation Machine, can do the formatting for you.

10. Don’t Stress – You’ve Got This!

When you write a biology paper, you don’t have to be afraid. You can be smart about it. You can plan it out. This way, you’ll have your biology paper done in a breeze. Start early. Stay organized. And seek out help when you need it. Remember – you have what it takes to deliver an awesome paper.

Prep Smart, Write Confidently

The key to nailing your biology paper lies in careful preparation, from choosing a specific topic to proofreading the final draft. Every step of the way, your preparation builds on the previous step to a well-researched, effective essay. Preparing well and writing with confidence are the best ways to conquer that college paper. So, grab a pen and get ready to ace your biology paper!

Darwinian Evolution – PreAP Biology

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Darwinian Evolution – PreAP Biology

Multiple Choice
Identify the choice that best completes the statement or answers the question.

Which of the following are examples of fossils?

a.	shells or old bones
b.	any traces of dead organisms
c.	insects trapped in tree sap
d.	All of the above

Animal fossils may form when

a.	an animal is buried by sediment.
b.	an animal is buried on the ocean floor, in swamps, in mud, or in tar pits.
c.	an animal’s tissue is replaced by harder minerals.
d.	All of the above

Darwin drew ideas for his theory from observations of organisms on

a.	the Samoan Islands.
b.	Manhattan Island.
c.	the Hawaiian Islands.
d.	the Galápagos Islands.

The species of finches that Darwin observed differed in the shape of their beaks. According to Darwin, all of these species probably

a.	had a common ancestor.
b.	had migrated from Africa.
c.	had descended from similar birds in Africa.
d.	ate the same diet.

Darwin thought that the animals of the Galápagos Islands were similar to those of the nearby coast of South America because

a.	the animals’ ancestors had migrated from South America to the Galápagos Islands.
b.	the animals had all been brought to the islands by humans.
c.	the islands had slowly drifted away from the mainland.
d.	the animals in both places had evolved in nearly identical environments

According to Darwin, evolution occurs

a.	only through artificial selection.
b.	during half-life periods of 5,715 years.
c.	because of natural selection.
d.	so rapidly that it can be observed easily.

When Darwin published his first book about evolution, he included all of the following ideas except

a.	the idea that species change slowly over time.
b.	the idea that some organisms reproduce at a greater rate than others.
c.	the idea that species are permanent and unchanging.
d.	the idea that some species become better suited to their environment than others.

The major idea that Darwin presented in his book The Origin of Species was that

a.	species change over time and never compete with each other.
b.	animals change, but plants remain the same over time.
c.	species may change in small ways but cannot give rise to new species.
d.	species change over time by natural selection.

Natural selection is the process by which

a.	the age of selected fossils is calculated.
b.	organisms with traits well suited to their environment survive and reproduce more successfully than organisms less suited to the same environment.
c.	acquired traits are passed on from one generation to the next.
d.	All of the above

10.

Populations of the same species living in different places

a.	do not vary.
b.	always show balancing selection.
c.	are genetically identical to each other.
d.	become increasingly different as each population becomes adapted to its own environment.

11.

Scarcity of resources and a growing population are most likely to result in

a.	decreased homology.
b.	increased genetic variation.
c.	increased competition.
d.	convergent evolution.

12.

Refer to the illustration above. An analysis of DNA from these organisms would indicate that

a.	they have identical DNA.
b.	they all have the same number of bones.
c.	their nucleotide sequences show many similarities.
d.	they all have the same number of chromosomes.

13.

Refer to the illustration above. The similarity of these structures is one form of evidence that the organisms

a.	share a common ancestor.
b.	all grow at different rates.
c.	evolved instantaneously.
d.	live for a long time.

14.

Refer to the illustration above. The bones labeled “X” can be referred to as

a.	vestigial structures.
b.	sequential structures.
c.	homologous structures.
d.	fossil structures.

15.

Which of the following is most likely a vestigial structure?

a.	the human tailbone	c.	flower color
b.	the beak of a finch	d.	a fossil of a snail

16.

Homologous structures in organisms provide evidence that the organisms

a.	share a common ancestor.
b.	must have lived at different times.
c.	have a skeletal structure.
d.	are now extinct.

17.

Anatomical structures that appear to be derived from a functional structure in an ancestor, but that currently do not serve an important function, are called

a.	inorganic.	c.	fossilized.
b.	mutated.	d.	vestigial.

18.

The beak of a bird and the beak of a giant squid evolved independently and serve the same function. The beaks are

a.	divergent structures.	c.	analogous structures.
b.	homologous structures.	d.	hybrid structures.

19.

Evidence that evolution occurs includes all of the following except

a.	acquired characteristics.
b.	similarities and differences in proteins and DNA sequences between organisms.
c.	the fossil record.
d.	homologous structures among different organisms.

20.

Cytochrome c is a protein that is involved in cellular respiration in all eukaryotic organisms. Human cytochrome c contains 104 amino acids. The following table compares human cytochrome c with cytochrome c from a number of other organisms.

Organism	Number of cytochrome c amino acids that differ from human cytochrome c amino acids
Chickens	18
Chimpanzees	0
Dogs	13
Rattlesnakes	20
Rhesus monkeys	1
Yeasts	56

Which of the following is not a valid inference from these data?

a.	Chimpanzees are more closely related to humans than yeasts are.
b.	The cytochrome c of chimpanzees differs from that of rhesus monkeys by only one amino acid.
c.	Dogs are more closely related to humans than chickens are.
d.	All of the proteins produced by chimpanzees and humans are identical.

21.

The accumulation of differences between populations that once formed a single population is called

a.	coevolution.
b.	adaptation.
c.	divergent evolution.
d.	cumulative differentiation.

22.

Over millions of years, plants and their pollinators have

a.	coevolved.	c.	become parasites.
b.	crossbred.	d.	become competitive.

23.

Refer to the illustration above. While the shark and dolphin are similar in appearance, dolphins evolved from ancestors that were very different from sharks. The current similarity between sharks and dolphins is an example of

a.	coevolution.	c.	convergent evolution.
b.	biogeography.	d.	divergent evolution.

24.

What is the idea developed by Charles Lyell which states that the geologic processes that shaped Earth in the past continue to operate in the same way today?

a.	inheritance of acquired characteristics
b.	catastrophism
c.	uniformitarianism
d.	descent with modification

25.

The idea of inheritance of acquitted characteristics was proposed by

a.	Charles Darwin.	c.	Jean-Baptiste Lamarck.
b.	George Cuvier.	d.	Charles Lyell.

26.

Which of the following describes a population?

a.	dogs and cats living in Austin, Texas
b.	four species of fish living in a pond
c.	dogwood trees in Middletown, Connecticut
d.	roses and tulips in a garden

27.

The movement of alleles into or out of a population due to migration is called

a.	mutation.	c.	nonrandom mating.
b.	gene flow.	d.	natural selection.

28.

What type of population is most susceptible to loss of genetic variability as a result of genetic drift?

a.	large populations
b.	medium-sized populations
c.	small populations
d.	populations that fluctuate in size

29.

A change in the frequency of a particular gene in one direction in a population is called

a.	directional selection.
b.	acquired variation.
c.	chromosome drift.
d.	stabilizing selection.

30.

The type of selection that may eliminate intermediate phenotypes is

a.	direction selection.
b.	disruptive selection.
c.	polygenic selection.
d.	stabilizing selection.

31.

Directional selection tends to eliminate

a.	both extremes in a range of phenotypes.
b.	one extreme in a range of phenotypes.
c.	intermediate phenotypes.
d.	None of the above; it causes new phenotypes to form.

32.

The large, brightly colored tail feathers of the male peacock are valuable to him because

a.	they attract potential predators.
b.	they warn off potential competitors for mates.
c.	they attract potential mates.
d.	they attract people who provide them with food.

33.

The hypothesis that evolution occurs at an irregular rate through geologic time is known as

a.	directional evolution.
b.	directional equilibrium.
c.	punctuated equilibrium.
d.	punctuated evolution.