Changes in the heritable attributes of populations of organisms over time. Major mechanisms include drift, natural selection, mutation, and gene flow (migration).


Evolution refers to the observed changes in successive generations of biological organisms due to heritable components. Charles Darwin proposed a major mechanism of evolution: Natural selection.

Common questions using this tag include:

  • What is the evolutionary origin of characteristic x?
  • At what point/in which organism was characteristic x first developed?
  • What is the evolutionary advantage given by characteristic x?
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