On Thursday, February 8, 2018 at 10:36:30 AM UTC-6, wrote:
On Thursday, February 8, 2018 at 9:16:08 AM UTC-6, Frank wrote:
On Wed, 07 Feb 2018 17:09:48 -0800, allisellis851 wrote:

The amount of Sunlight over generations affects the pigment, changes
skin color.

The thinking now is that people moved from Africa north to Europe and
west to Asia.

People rely on sunlight to synthesize vitamin D, which is needed for
healthy bones. This is a particular problem for growing children.

There's always some variation in skin color, even within families, and
the lighter skinned people could establish communities further north.

And that's the story.

Nobody would have moved anywhere if the Dinosaurs haden't first been wiped out.

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