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image: How, If, and Why Species Form

How, If, and Why Species Form

By , , and | November 1, 2013

Biologists have struggled for centuries to properly define what constitutes a “species.” They may have been asking the wrong question—many smaller organisms might not form species at all.

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image: Fighting to exist

Fighting to exist

By | June 14, 2011

The more closely related two species are, the more they're apt to drive one another to extinction.

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