Marine biology

2. Ectotherms are organisms whose body temperature is largely determined by heat exchange with their surroundings.
3. An organism possessing both male and female organs
4. one of two principal body types occurring in members of the invertebrate animal phylum Cnidaria
5. a system of vessels in echinoderms containing a circulating watery fluid that is used especially for the movement of tentacles and tube feet.
7. a form of symmetry in which the opposite sides are similar
8. Lack of balanced portions between parts of a thing
9. A tough, flexible tissue that lines joints and gives structure to the nose, ears, larynx, and other parts of the body.
13. located in the body cavity and is derived from an outpocketing of the digestive tube
15. the heritable condition of possessing more than two complete sets of chromosomes
16. an organ that connects the developing fetus to the uterine wall, thereby allowing nutrient uptake, waste elimination, and gas exchange via the mother's blood supply
18. warm-blooded animals
20. an internal skeleton or supporting framework in an animal

1. an animal without back bone
4. the shedding or casting off of an outer layer or covering and the formation of its replacement
6. an animal that has a backbone and a skeleton
10. Eggs that contain an amnion to protect the embryo
11. a hard covering that supports and protects the bodies of some types of animals
12. a highly evolved and specialized organ developing on each side of the anterior chest wall
14. the arrangement of a pattern in a wedge-like fashion around a fixed, central point
17. a form of asexual reproduction in which a new individual develops from some generative anatomical point of the parent organism
19. bottom-living animals that may live on the seafloor or below the sediment