Marine Animals

3. located in the body cavity and is derived from an outpocketing of the digestive tube
6. an external anatomical feature that supports and protects an animal's body
8. any member of the mammalian group characterized by the presence of a placenta
10. a body plan in which the body can be divided into mirror images along a central axis
14. the formation of an outgrowth (bud) from an organism.
15. A type of connective tissue that is firm and flexible and having an extracellular matrix comprised mainly of chondroitin sulphate
17. epidermal organs derived from modified sweat glands.
19. An air-breathing egg characterized by a shell and extraembryonic membranes.
20. a system of canals in echinoderms containing a circulating watery fluid that is used for the movement of the tentacles and tube feet.
21. an organism must produce its own body heat through metabolism

1. the shedding or casting off of an outer layer or covering and the formation of its replacement.
2. vertebrates that live in marine environments
4. Animals that lack backbones
5. one of two principal body forms occurring in members of the animal phylum Cnidaria
7. any so-called cold-blooded animal
9. a single individual has both male and female reproductive organs at some point in life
11. one of two principal body types occurring in members of the invertebrate animal phylum Cnidaria
12. having disproportionate arrangement of parts
13. a skeleton that consists of hard, mineralized structures located within the soft tissue of organisms
16. the regular arrangement of body parts around a central axis
18. hose marine ecosystems consisting of organisms living on, attached to, or burrowing in the sediment of the ocean floor.