LIFE OVER TIME (UNIT 6)
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19 terms
Terms | Definitions |
|---|---|
 evolution | the process in which populations gradually change overtime. |
| artificial selection | the practice by which humans select plants or animals for breeding based on desired traits. |
| natural selection | is the process by which organisms that inherit advantageous traits tend to reproduce more successfully that other organisms do. |
| variations | natural differences. |
| adaptation | an inherited characteristic that helps an organism survive and reproduce in its enviorment. |
| extinction | all members of a species have died. |
| fossils | remains or imprints of once-living organisms. |
| fossil record | all of the fossils that have ever been discovered make up the fossil record. |
| species | a group of organisms that are very closely related. |
| genus | includes similar species. |
| domain | represents the largest differences among organisms. |
| bacteria | made up of prokaryotes that usually have a cell wall, and reproduce by cell division. |
| archaea | made up of prokaryotes. |
| eukarya | made up of all eukaryotes. |
| animalia | contains multi-cellular organisms that lack cell walls. they are able to move, and have specialized sense organs. |
| plantae | consists of multi-cellular organisms that have cell walls, cannot move around, and make tehre own food. |
| protista | *called protists are single-celled or simple multi-cellular organisms such as algae, protozoans, and slime molds. |
| fungi | get energy by absorbing materials and have cells with walls, but no chloroplasts. |
| dichotomous key | uses a series of paired statements to identify organisms. |
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