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We are equal human beings, and we were born with evil and anger and misunderstanding of what a man is, and so we are as needy and wanting to be part of him, as he, obviously, was needing and wanting to be part of us. And that's why I've really taken the freedom, because it's an adaptation, to give her a voice.
— Liv Ullmann
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Another way to test hypotheses about adaptation is to consider trait variation across a group of species instead of focusing on the trait of a single species. Rather than seeking to explain why polar bears have fur of a certain thickness, one tries to explain why bears in colder climates have thicker fur than bears in warmer climates. The former problem is hard to solve, since it is hard to say exactly what fur thickness polar bears should have if natural selection guided the evolution of that trait.
— Elliott Sober
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