| A | B |
|---|
| amniotic egg | in reptiles, the leathery egg that provides a complete environment for the developing embryo |
| amphibian | ecothermic vertebrate that spends part of its life in water and part on land; examples are frogs, toads, and salamanders |
| biological indicator | species whose health reflects the health of its ecosystem |
| cartilage | a thick, tough, smooth flexible tissue that is harder than flesh but softer than bone (like your ears); it covers the ends of bone to allow movement and cushion shock |
| chordate | a member of the animal phylum chordate that has a notochord, a dorsal hollow nerve cord, and gill slits at same time in tis life cycle |
| dorsal hollow nerve cord | a tubular bundle that lies above the notochord in a chordate animal; the spinal cord in most vetebrates |
| ecotherm | vertebrate animal whose internal body temperature changes with its environment |
| enodskeleton | th internal skeleton of an organism that supports and protects the internal organs and provides a frame for muscle |
| enotherm | vertebrate animal that maintains a constant body temperature |
| estivation | an adaption for survival in hot, dry weather during which an animal becomes inactive and all body processes slow down |
| fin | fanlike structure on most fish; adapted for steering, balancing, and moving thorugh water |
| fish | an ectothermic vetebrate whose gills, fins, and scales adapt it to living in water |
| gill slit | paried openings in the throat; in fish, they develop into gills for breathing underwater |
| hibernation | an adaption for winter survival during which an animal becomes inactive and all body processes slow down |
| notochord | a flexible, rodlike structure along side (back) of a chordate animal; the backbone n vertebrates |
| reptile | an ectothermic vertebrate that has dry, scaly skin and that lays eggs covered with a leathery shell; examples: are lizards, snakes, and turtles |
| scale | hard, thin overlapping plates that cover and protect a fish's body |
