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Descent Modification
Bio IV Evo4
| Term | Definition |
|---|---|
| descent with modification | species arise from earlier ancestors as each collects unique modifications over time |
| speciation | formation of a new species when no longer can breed with related populations |
| fossil | preserved evidence of organisms in rock formations |
| biogeography | distribution of organisms on the planet |
| comparative anatomy | comparing structures between different organisms |
| homologous trait | traits that may have different functions, but inherited from a common ancestor; due to divergent evolution |
| analogous trait | similar traits NOT inherited from a common ancestor; due to convergent evolution |
| vestigial trait | homologous adaptation that is no longer useful in current forms |
| divergent evolution | two related species splitting from a common ancestor; share homologous traits but becoming LESS similar over time |
| convergent evolution | two unrelated species developing analogous traits as become more similar under similar environmental pressures |
| coevolution | two species in a close relationship act as selection pressures on each other |
| extinction | every member of a species has died |