Evolution Timeline

Do all species evolve at the same rate of speed?
Answered by Science Channel
  • Science Channel

    Science Channel

  1. No -- it differs from species to species. Some species can remain unchanged for millions of years, and yet other creatures can appear and then become extinct within just a few hundred thousand years. It's also true that within a given species, the pace of evolution can vary throughout its history. Many species experience rapid change, in terms of geologic time, and then long periods where nothing changes, something scientists call punctuated equilibrium.

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