South America Once a Massive Island, the Average Annual Shift Rate of Tectonic Plates, Cat vs Dog Paw Rotation and the Reason for This, and Sharks Raising Young as Reptiles Do

5,000,000 (5 million) years ago, North and South America were 600 kilometers apart making South America a massive, isolated island. On average, tectonic plates only move 5 centimeters per year, which is a growth rate slower than that of a human being growing fingernails. Mastadons originated in North America 10,000,000 (10 million) years ago. Cats can rotate their paws the same way human beings can rotate their wrists, but dogs cannot do this their paws are locked in a static position. This lack...

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