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A member asked:
How can sharks constantly have new teeth growing but humans can't?
A doctor has provided 1 answer
That's normal: Why do elephants have tusks and human's don't? Same idea. That's the beauty of the variety of life on this planet. Sharks need replaceable rows of pointy teeth because they damage them when feeding. We need a variety of permanent teeth because they have different functions. It's natural selection.
Answered 4/9/2013
5.2k views
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