| A | B |
|---|
| BIOSPHERE | Life supporting zone, which includes all plants, animals, and unicellular organisms, at or near the earth’s surface. |
| HYDROSPHERE | Zone that includes all water under, on, and over the earth’s surface |
| ATMOSPHERE | the layer of gases that surround the earth; 1) nitrogen, 2) oxygen |
| CELL | The basic unit of an organism that can perform all life processes |
| METABOLISM | The constant balancing of an organism’s energy producing processes |
| STIMULUS | change that occurs in an organism’s environment that causes a response |
| RESPONSE | A response is a reaction to a stimulus |
| REPRODUCTION | process of organisms creating more organisms like themselves |
| ADAPTATION | characteristic of an organism that enables that organism to survive in its environment. |
| HOMEOSTASIS | maintain a consistent internal environment |
| ENDOTHERMIC | animals that need to use food energy to maintain a constant body temperature; referred to as “warm-blooded” |
| ECTOTHERMIC | animals that do not use food energy to maintain a constant body temperature; they depend on the temperature from the environment |
| COMPETITION | struggle between organisms for food, water, energy, and space |
