| A | B |
| organism | any living thing |
| stimulus | a change in the environment that causes a response |
| offspring | a new organism produced by a living thing |
| reproduction | the way organisms make more of their own kind |
| cell | the basic unit of structure and function in all living things |
| unicellular | having one cell |
| multicellular | having more than one cell |
| homeostasis | the process by which organisms keep their internal conditions relativaly stable |
| response | a reaction to a stimulus |
| spontaneous generation | the idea that living things can come from nonlivng things |