How lengthy do new species take to evolve?

Charles Darwin famously marveled on the “countless types most stunning and most fantastic” produced by evolution, and certainly, Earth at present teems with an estimated 1 trillion species. However how lengthy did it take these species to evolve?

The reply varies broadly throughout lifeforms, “relying on taxa [type of creature] and environmental circumstances,” Thomas Smith, a professor of ecology and evolutionary biology on the College of California, Los Angeles, instructed Dwell Science. It ranges from human-observable timescales to tens of hundreds of thousands of years.

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