The History of Life on Earth
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Created by:
jjarnaez04 on February 2, 2010
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Chapter 14
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11 terms
Terms | Definitions |
|---|---|
 fossils | remains of organisms preserve in the earth |
| unicellular organisms | organisms made up of a single cell |
| multicellular organisms | living things made up of many cells |
| mass extinction | huge numbers of species that have died in a short time |
| evolution | the process though which species change over time |
| natural selection | members of a species that are best suited to their environment survive and reproduce faster |
| adaptation | any inherited trait that gives an organism an advantage in its particular environment |
| speciation | evolution of new species from existing species |
| vestigial organ | physical structures that were fully developed and functional in an ancestral group but are reduced and later not used |
| gene | is a segment of DNA that relates to a specific trait or function in an organisms |
| ancestor | early form of organism that later forms decendents |
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