How long does it take for new species to evolve?

Charles Darwin admired the “infinite forms, the fairest and most wonderful” produced by evolution, and indeed, The Earth today teems with estimated at 1 trillion species. But how long did it take for these species to evolve?

The answer varies greatly among life forms, “depending on taxa [type of creature] and environmental conditions,” Thomas Smith, professor of ecology and evolution biology at UCLA told Live Science. It ranges from human-observable time scales to tens of millions of years.

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