| A | B |
|---|
| organisims | a living thing |
| unicellular | single celled organism |
| multicellular | organisms that are composed of many cells |
| development | process of change that occurs during an organisim's life to produce a more complex organism |
| stimulus | a change in an organisims surroundings that causes the organism to react |
| response | an action or change in behavior due to a stimuli |
| reproduce | to produce offspring that are similar to the parents |
| spontaneous generation | The mistaken idea that living things arise from nonliving sources |
| controlled experiment | a scientist carries out two tests that are identical in every respect except for one factor |
| variable | the one factor that a scientist changes in a controled experiment |
| autotrophs | organisims that make their own food |
| heterotrophs | organisims that cannot make their own food |
| homeostasis | The maintenance of stable internal conditions despite changes in the surroundings |
| fossils | traces of ancient organisims that have been preserved in rock or other substances |
| classification | the process of grouping things based on their similarities |
| binomial nomenclature | Carolus Linnaeus's naming system where each organism is given a two part name |
| genus | the first part of an organisims scientific name, a classification grouping that contains similar, closely related organisims. |
| species | the second part of an organisims scientific name, a group of similar organisims that can mate and produce fertile offspring in nature. |
| evolution | process by which species gradually change over time |
| taxonomic key | a series of paired statements that describe the physical characteristics of different organisims. |
