| A | B |
|---|
| organism | a living thing |
| cell | the basic unit of structure and function in all living things |
| unicellular | composed of only one cell |
| mulitcellular | composed of many cells |
| stimulus | a change in an organism's environment that causes the organism to react |
| response | a reaction or change in behavior caused by a stimulus |
| development | process of change that occurs during an organism's life to produce a more complex organism |
| spontaneous generation | the mistaken idea that living things can arise from nonliving sources |
| autotrophs | organisms that can make their own food |
| heterotrophs | organisms that cannot make their own food |
| homeostasis | maintaining stable internal conditions |
| classification | the process of grouping things based on their similarities |
| taxonomy | the study of how living things are classified |
| binomial nomenclature | naming system created by Linnaeus |
| genus | classification grouping that contains similar, closely related organisms |
| species | a group of similar organisms that can mate with each other and produce offspring |
| prokaryotes | organisms whose cells lack a nucleus |
| nucleus | a dense area in a cell that controls all cell activity |
| eukaryotes | organisms with cells that contain nuclei |
