| A | B |
|---|
| adaptation | a body part or behavior that helps an organism survive. |
| basic needs | Food, water, air, and shelter that an organism needs to survive. |
| instinct | a behavior that an animal begins life with and that helps it meet its needs. |
| hibernation | a dormant, inactive state in which normal body activities slow. |
| migration | the movement of animals from one region to another and back. |
| learned behavior | a behavior that an organism doesn't begin life with. |
| fossil | the remains or traces of a plant or an animal that lived long ago |
| extinction | the death of all the members of a certain group of organisms. |
