1. Approximately what
percentage of animals are invertebrates?
What are invertebrates?
3. Name the phyla of
invertebrates and members of each phyla.
__________ are in the phylum Porifera. There
are about _____ different species & most of
these are _________ organisms found in oceans & seas.
A few sponges are found in __________,
but these are small and not brightly colored.
Sponges are _____________ that trap __________ from water as it flows through
Sponges have no basic body arrangement and are said to be ________________.
Sponges live attached to one spot as adults so they are __________.
The skeleton of sponges is made of a flexible protein called ___________ and
hard fibers called __________
which are composed of calcium carbonate or silicon dioxide.
9. Sponges are full
of holes called __________ through which water flows into their __________
10. Sponges are the simplest
animals and lack the __________ level of specialization like all
other animals. Sponges do have some specialized _________ in their
11. Special cells
called choanocytes line the pores and have __________ that spin to pull in
__________cells at the base of choanocytes capture plankton from the water
& start digesting it.
_______________ are special cells that carry this food to all other parts of
Wastes and excess water leave a sponge through a large opening at the top
called the __________.
15. Sponges reproduce
asexually by internal or external __________ and by _______________ whenever
a piece of a sponge breaks off. This
last method helps sponges form _____________.
16. Sponges reproduce
sexually also and are _______________ producing both eggs and sperm. Sponges
__________ sperm with each other and do not fertilize their own eggs.
Internal buds or ____________ form if the freshwater supply evaporates and are
release when the sponge
__________ and become ___________ when freshwater returns.
The phylum Cnidaria includes what organisms?
All cnidarians are _______________ organisms except for the __________ which
is found in freshwater.
19. Cnidarians all
have _______________ symmetry and _____________ or arms that have stinging
cells called _______________. These
stinging cells shoot out like a _______________ and contain a __________ that can kill or paralyze
Cnidarians have _____ body layers; an inner _______________ and an outer
Cnidarians have _______ opening into their hollow bodies called the __________
so food enters and wastes leave
through this same opening. This
is called a ________________ digestive system.
22. The hollow cavity
the mouth opens into is called the ____________________ cavity.
23. Cnidarians have 2
body forms. ___________ forms have the mouth & tentacles located at the
top like Hydra, corals, and sea anemones. _____________forms
like the jellyfish have their tentacles and mouth located at the bottom.
Some cnidarians like the _______________ go through both polyp and medusa
forms in their life cycle.
25. Cnidarians have a
simple nerve _________ and can reproduce both _____________ and _____________.
Corals build _____________ cases that make underwater ___________.
Flatworms are in the phylum _______________ and are flattened ______________
with __________ symmetry.
28. Flatworms are
said to be _________________ because of their solid body.
____________ are parasitic flatworms having only _______ body opening called the
Specialized _____________ cells remove wastes.
The ______________ is the most common free living flatworm.
It is found in __________ or _____________ places.
produce both eggs and sperm and are said to be ________________; however, they
_____________ sperm with other planarians.
Planarians also reproduce asexually by _________________.
33. Flukes and
tapeworms usually live in their host's ______________ tract resistant to
digestive _______________ allowing the __________ to digest their food.
34. Tapeworms are
divided into sections called _________________ with complete _________________ structures.
The head is called the _______________ and has both _________________ and ______________ to attach to the host.
35. Tapeworms are ___________________ and ______________ their own eggs which pass out of the host's body in ripe ____________________ along with feces.
36. Humans get tapeworms
from eating _______________________, while children pick up tapeworm
eggs from ________________ boxes.
_______________ are in the phylum Nematoda and are _________________ in shape
and ________________ at both ends.
38. Roundworms are
____________________ because their body cavity or ________________is not fully lined.
The body cavity is filled with fluid giving them a
39. Roundworms have a complete gut with both a ______________ and an _____________