| A | B |
|---|
| amphibian | An animal that begins life in the water and moves onto land as an adult |
| bird | An animal that has feathers, two legs, and wings. |
| fish | An animal that lives its entire life in water. |
| gill | Body parts that take in oxygen from the water. |
| inherit | To have a trait passed on from the parents of the organism. |
| larva | The stage of complete metamorphosis after an organism hatches from its egg. |
| life cycle | The changes that happen to an animal during its life. |
| mammal | An animal that has hair or fur. |
| metamorphosis | A series of changes in appearance that some organisms go through. |
| oxygen | A gas that people need to live and plants give off into the air. |
| pupa | The stage of complete metamorphosis where an organism is wrapped in a cocoon or chrysalis. |
| reptile | A land animal that has dry skin covered with scales. |
| scales | Small, thin, flat plates that help protect an animal. |
| extinction | The death of all the members of a certain group of organisms. |
| fossil | The remains or traces of a living thing that lived long ago. |
| adaptation | Any trait that helps a plant or animal survive. |
| camouflage | Colors, patterns, and shapes that disguise an animal and help it hide. |
| community | All the populations of organisms that live in an ecosystem at the same time. |
| desert | An ecosystem that is very dry. |
| ecosystem | The living and nonliving things that interact in an environment. |
| environment | The things, both living and nonliving, that surround a living thing. |
| forest | An ecosystem in which many trees grow. |
| grassland | A dry, hot area of land that is hot in the summer and cold in the winter. The main plants found in this ecosystem are grasses. |
| habitat | The place where a population lives in an ecosystem. |
| hibernate | To go into a sleeplike state for winter. |
| instinct | A behavior an animal knows without being taught. |
| migrate | To travel from one place to another and back again. |
| mimicry | Imitating the look of another animal. |
| population | A group of organisms of the same kind that live in the same place. |
