Monday, December 13, 2010

The ancestor of the Chihuahua is the wolf.

From wolf to chihuahua in a few thousand years thanks to artificial selection.

From ARDI to modern humans in four million years thanks to natural selection and sexual selection.

Artificial selection is faster than natural selection, but people have been breeding animals and plants for only a few thousand years, while natural selection has had almost four billion years to develop the diversity of life we can see today.

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