| A | B |
|---|
| vertebrate | an organism with a backbone |
| chordate | an organism that has a notochord, nerve cord, postanal tail and pharyngeal pouches at some point in their development |
| ectotherm | an organism that has a body temperature that changes with the temperature of the environment |
| endotherm | an organism that has a body temperature that stays constant |
| fish | an organism that has fins, gills, and scales |
| amphibian | an organism that has a two-part life cycle; part water-part land |
| reptiles | an organism that lays eggs on land, is independent of water and has scales and claws |
| mammal | an organism that gives birth to live young and feeds its young with milk from mammary glands |
| amniotic egg | an egg that contains all the nutrients and structures necessary to support life |
