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Unit 6, Lessons 1-3
Term | Definition |
---|---|
evolution | refers to the process by which populations change over time |
artificial selection | the practice by which humans select plants or animals for breeding based on desired traits |
natural selection | the process by which organisms that inherit advantageous traits tend to reproduce more successfully than other organisms do |
variation | within a species there are naturally occurring differences in traits |
mutation | an important source of variation, or change in genetic material |
adaptation | an inherited trait that helps and organism survive and reproduce in its environment |
extinction | occurs when all members of a species have died |
fossil | the remains or imprints of once-living organisms |
fossil record | all of the fossils that have been discovered make up |
geologic time scale | the standard method used to divide Earth's long 4.6 billion year natural history into manageable parts |