Simple Animals: Porifera & Cnidarians

1. one of two principal body forms occurring in members of the animal phylum Cnidaria. T
6. long, hair-like structures that protrude from certain cells and are primarily used for locomotion
8. a genus of small, tube-shaped calcareous sponges belonging to the family Sycettidae
9. small openings or pores in the body of an animal or in an organ within the body
10. the central cavity of a sponge's body
13. having both male and female reproductive organs in the same individual.
14. the large opening on a sponge through which water exits the body
17. small, hard, needle-like structures that form the skeletal components of various marine and freshwater invertebrates, such as sponges
18. a free-swimming, larval stage in the life cycle of many cnidarian species, like jellyfish, corals, and sea anemones.
19. relating to or occurring at the bottom of a body of water,
21. a form of asexual reproduction where a new organism develops from a small outgrowth or "bud" on the body of a parent organism

2. An organism is considered plankton if it is carried by tides and currents, and cannot swim well enough to move against these forces.
3. organisms that have both male and female reproductive organs, and can produce both male and female gametes.
4. the condition of an animal being either male or female.
5. the immature stage of an animal that occurs between the egg and adult stages
7. a type of sponge with a simple body plan and a distinct water circulatory system
8. does not move
11. a type of sponge with a complex structure that includes a thick body wall and a highly branched canal system
12. organisms that eat by filtering small food particles from water
15. a free-swimming, bell-shaped stage of the Cnidaria phylum of invertebrates, and is the typical form of a jellyfish
16. a flexible material that makes up the fibrous skeleton of most sponges, and is a modified type of collagen protein:
20. the contraction of the heart muscle