| A | B |
| organism | a living thing |
| cell | the basic unit of structure and function in an organism |
| unicellular | single-celled organism |
| multicellular | organisms that are composed of many cells |
| adaptation | a behavior or physical characteristic that allows an organism to survive or reproduce in it's environment |
| stimulus | a change in an organism/s surroundings that causes the organism to react |
| response | an action or change in behavior |
| 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 can arise from nonliving things |
| autotroph | organisms that make their own food |
| heterotroph | organisms that can not make their own food |
| homeostasis | the maintenance of stable internal conditions |
| classification | the process of grouping things based on their similarities |
| taxonomy | the scientific study of how living things are classified |
| binomial nomenclature | the naming system Linnaeus used |
| genus | a classification grouping that contains similar, closely related organisms |
| species | a group of similar organisms that can mate with each other and produce offspring that can also mate and reproduce |