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braswell 7th ga Cousins Middle

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
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