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evolution
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Term | Definition |
---|---|
Adaptation | a trait that increases the chances that an organism will survive and reproduce |
Darwin | was a naturalist who proposed and provided scientific evidence that all species of life have evolved over time from common ancestors through the process he called natural selection. |
evolution | the change in population of a species over time |
extinction | The evolutionary termination of a species caused by the failure to reproduce and the death of all remaining members of the species; the natural failure to adapt to environmental change |
fossil | evidence of past life preserved in rock |
fossil record | the complete body of fossils that shows how species and ecosystems change over time |
natural selection | survival of the fittest organisms that are the best adapted to their environment and the ones that will live long enough to reproduce and pass on their favorable adaptation |
species | the most specific classification of living things |
theory | an explanation that ties together many hypothesis and observations |
absolute dating | any method of measuring the age of an event or object in years. the actual age for a rock or mineral |
relative dating | uses information about rock layers and the fossil record to determine the age relationships between rocks |
index fossil | a fossil found in a narrow time range but widely distributed around the earth; used to date rock layers |
law of superposition | states that the oldest rocks lie on the bottom and the youngest rocks are on top of any undisturbed sequence of sedimentary rocks |
variation | naturally occurring differences within a group |