| A | B |
|---|
| biosphere | life-supporting zone around the earth |
| atmosphere | envelope of gasses surrounding the earth |
| cell | basic unit of all living things |
| metabolism | system of balancing energy input, output, and storage |
| stimulus | change in the environment |
| response | reaction to a stimulus |
| reproduction | producing more organisms like themselves |
| adaptation | characteristic or structure that helps an organism survive |
| endotherm | an animal that can maintain a constant internal body temperature (warm blooded) |
| ectotherm | an animal that cannot maintain its body temperature (cold blooded) |
| homeostasis | maintaining conditions inside the body the same even though environment changes |
| competition | struggle for survival |
| needs | things organisms cannot live without |
| life processes | characteristics of being alive |
