| A | B |
|---|
| organism | a living thing |
| cell | the basic unit of structure and function in living things |
| unicellular | made of a single cell |
| multicellular | consisting of many cells |
| stimulus | a change in an organism's surroundings that causes the organism to react |
| response | an action or change in behavior that occurs in reaction to a stimulus |
| development | the process of change that occurs during an organism's life to produce a more complex organism |
| spontaneous generation | the mistaken idea that living things arise from nonliving sources |
| homeostasis | the maintenance of stable internal conditions in an organism |
| prokaryote | an orgainism whose cells lack a nucleus and some other cell structures |
| nucleus | the control center of a eukaryotic cell that directs the cell's activities and contains the information that determines the cell's form and function |
| eukaryote | an organism whose cells contain nuclei |
