Marine Animals

2. An organism whose body temperature is largely determined by heat exchange with its surroundings
3. an organism that has both male and female reproductive organs
4. a Gorgon, a monstrous creature with snakes for hair and the ability to turn onlookers to stone
5. (in an echinoderm) a network of water vessels in the body, the tube feet being operated by hydraulic pressure within the vessels.
7. the property of being divisible into symmetrical halves on either side of a unique plane.
8. lack of equality or equivalence between parts or aspects of something; lack of symmetry.
9. a tough, flexible connective tissue that provides support and protection to various parts of the body.
13. a gas-filled sac present in the body of many bony fishes, used to maintain and control buoyancy.
15. a non-cancerous growth that protrudes from the surface of an organ or tissue
16. a flattened circular organ in the uterus of pregnant eutherian mammals, nourishing and maintaining the fetus through the umbilical cord.
18. (of an animal) dependent on or capable of the internal generation of heat.
20. an internal skeleton, such as the bony or cartilaginous skeleton of vertebrates.

1. an animal lacking a backbone, such as an arthropod, mollusk, annelid, coelenterate, etc.
4. (of an animal) shed old feathers, hair, or skin, or an old shell, to make way for a new growth.
6. an animal of a large group distinguished by the possession of a backbone or spinal column, including mammals, birds, reptiles, amphibians, and fishes.
10. Eggs that contain an amnion
11. a rigid external covering for the body in some invertebrate animals, especially arthropods, providing both support and protection.
12. modified sweat glands that produce and secrete milk for nourishing infants or young mammal
14. symmetry around a central axis, as in a starfish or a tulip flower.
17. (of a plant) having or developing buds.
19. anything associated with or occurring on the bottom of a body of water.