Gender task specialization in mammal packs over millions of years was the best way to guarantee survival and evolution.

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This evolution is about survival of the fittest - which policy mutation allows the most votes to survive.

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It's Darwin's theory of evolution and the survival of the fittest.

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Darwinian evolution requires genetic diversity plus competition that yields the survival of the fittest.

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Millions of years of evolution have honed the skeleton into the perfect shape for survival.

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These curious hominids lived about two million years ago in an era that scientists consider the crucible of human evolution, when four or more apelike hominid species struggled for survival in Africa.

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