| Term | Definition |
| cell | the basic unit of structure and function in an organism |
| unicellular | single celled |
| multi cellular | organisms composed of many cells that are specialized to do certain tasks |
| 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 geneartion | the mistaken idea that living things can arise from nonliving things |
| autotrophs | organisms that make their own food |
| heterothrophs | organisms that cannot make their own food |
| homeostasis | the maintanance of stable internal conditions |
| classification | the process of grouping things based on similarities |
| taxonomy | the scientific study of how living things are classified |
| binomial nomeclature | naming system given by Linnaeus-gives tow part scientific name |
| genus | a classification grouping that contains similar, closely related organisms |
| prokaryotes | organisms whose cells lack a nucleus |
| nucleus | a dense area in a cell that contains nucleic acids |
| eukaryotes | organisms with cells that contain nuclei |