Sunday, February 01, 2009

Turtle Update: Mystery Solved?

Researchers may have found origin of turtle's mysterious shell: "Turtles have lived a long time without changing much.

They've had a broad top shell and smaller bottom one for something like 216 million years, as they evolved into sea-living giants and little turtles in ponds.

But the shell has always been a puzzle. How does an animal evolve a shell?"

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