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by _moof
3 days ago
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I can't find the source now but an idea that really stuck with me is that evolution happens on the margins. If a 0.0001% increase in the height of a giraffe makes it 0.0001% more likely that the giraffe will survive and reproduce, then in 1 million years giraffes as a species will become taller. As for humans: I mean, duh? The selective pressures faced by humans have changed radically in the time we've been around. |
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