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Life Science 4
Evolution and genetic variation
| Question | Answer |
|---|---|
| Adaptation | a characteristic that helps an organism survive in its environment |
| Evolution | the process by which populations accumulate inherited changes over time |
| Fossil | solidified remains or imprints of a once living organism |
| Fossil record | a historical sequence of life indicated by fossils found in layers of the Earth's Crust |
| Vestigial Structure | the remnant of a once useful anatomical structure |
| trait | a distinguishing quality that can be passed from one generation to another |
| Natural selection | the process by which organisms with favorable traits survive and reproduce at a higher rate than those without that trait;"survival of the fittest" |
| Variation | differences that occur naturally in individuals and may affect their ability to survive, particularly when there is a change in the environment |
| Relative dating | determining whether an event or object, such as a fossil, is older or younger than other events or objects |
| absolute dating | determining the age of an object or event in years, usually by measuring the amount of unstable atoms in the sample |
| geologic time scale | the division of the Earth's history into distinct intervals of time |
| extinct | describes a species of organisms that has died out completely |
Created by:
wftate
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