| Adaptation | Common Ancestors | Natural Selection | Geologic Time |
|---|---|---|---|
| homologous structures | a fossil | natural selection | millions |
| a mutation | extinct | evolution | dinosaurs |
| a variation | a species | homo sapiens | bacteria |
| an adaptation | apes and humans | Charles Darwin | eons, era, period, epoch, mya |
| What are vestigial structures | a common ancestor | the struggle for existence/competition | brown beetles |
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| Online Jeopardy |
Online Jeopardy. Updated: Jun 01, 2010. | |