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The Highway of Life

The Highway of Life
The earliest mammal-like reptiles, called pelycosaurs ruled the earth for about 40 million years, and gave rise to the therapsids...one step closer to mammals. Therapsids are the direct ancestor of mammals.


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Rating: 2.9 / 5 (769 votes)
Posted by Skywalker on December 12, 2010
Hits: 3095

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