As the environment change (including human factors, competition), so will be species that "fit" into it.
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dye 發表於 2011/11/10 14:59 
I do not agree.
If species "fit" into the environment, Eskimos would have fur to keep warm, but they don't. They are just as hairless and everyone else.
If species "fit" into the environment, humans in the tropics would have silver, reflective skin to help them keep cool, but they don't. They have black skin, just the opposite of what the theory of natural selection would predict. |