Simple Animals

2. One of two principal body forms occurring in members of the animal phylum Cnidaria
7. capable of or producing contraction
8. a small opening or orifice, as at the end of the oviduct. Zoology. one of the tiny holes in the body of a sponge
10. having both the male and female reproductive organs in the same individual; hermaphrodite
11. the internal cavity of a sponge discharging by way of the osculum
12. juvenile form many animals go through before turning into adults
13. a free-swimming sexual form of a coelenterate such as a jellyfish, typically having an umbrella-shaped body with stinging tentacles around the edge. In some species, medusae are a phase in the life cycle which alternates with a polypoid phase
15. Seafloor animal
16. organism that has both kinds of reproductive organs and can produce both gametes associated with male and female sexes
18. a large aperture in a sponge through which water is expelled
19. small organisms in the water; provide food source to other sea animals
20. type of asexual reproduction
21. a type of sponge having an oval shape and a thin body wall with pores leading directly into the spongocoel

1. a slender threadlike structure, especially a microscopic appendage that enables many protozoa, bacteria, spermatozoa, etc. to swim
2. free-swimming or crawling larval type common in many species of the phylum Cnidaria
3. filtering out plankton or nutrients in water
4. attacthed at the base without a stalk or pednucle
5. having the male and female reproductive organs in separate individuals
6. a sponge of the most complex structure, composed of a mass of flagellated chambers and water canals
9. one of the small, hard, calcareous or siliceous bodies that serve as the skeletal elements of various marine and freshwater invertebrates
14. genus of calcareous sponges belonging to the family Sycettidae
17. a modified type of collagen protein, forms the fibrous skeleton of most organisms among the phylum Porifera, the sponges