| 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 |
| autotroph | an organism that makes its own food |
| heterotroph | an organism that cannot make its own food |
| homeostasis | the maintenance of stable internal conditions in an organism |
| classification | the process of grouping things based on their similarities |
| taxonomy | the scientific study of how living things are classified |
| binominal nomenclature | the system for naming organisms in which each organism is given a unique, two-part scientific name |
| genus | a classification grouping that consists of a number of similar, closely related species |
| species | a group of organisms that are physically similar and can mate with each other and produce offspring that can also mate and reproduce |
| 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 |
