Marine Animals

2. organism in which internal physiological sources of heat are of relatively small or of quite negligible importance in controlling body temperature
3. animal or plant having both male and female reproductive organs
4. one of two principal body types occurring in members of the invertebrate animal phylum Cnidaria.
5. system of canals in echinoderms containing a circulating watery fluid that is used for the movement of the tentacles
7. basic body plan in which the left and right sides of the organism can be divided into approximate mirror images of each other along the midline
8. animal with no pattern or symmetry
9. Flexible connective tissue composed of cells and protein
13. an internal gas-filled organ that contributes to the ability of many bony fish to control their buoyancy
15. a solitary or colonial sedentary form of a coelenterate, typically having a columnar body with the mouth uppermost surrounded by a ring of tentacles.
16. structure in the pregnant uterus for nourishing a viviparous fetus with the mother's blood supply
18. animals that must generate their own heat to maintain an optimal body temperature
20. skeleton that is on the inside of a body

1. animal lacking a backbone
4. shedding or casting off of an outer layer or covering and the formation of its replacement
6. also called Craniata
10. air-breathing egg characterized by a shell and extraembryonic membranes
11. the external skeleton that supports and protects an animal's body
12. organ in female mammals that produce milk for their young
14. has more than one line that divides the organism into two mirror images
17. type of asexual reproduction in which a new organism develops from an outgrowth or bud due to cell division at one particular site
19. animals or plants that live upon the seafloor or upon bottom objects