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名前：Abigail日付：2015/01/05 00:17:46
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Once-useful traits, however, can become worthless. Some can even become detrimental. That can happen if a species moves to a new environment â or if its environment changes. Now, a different trait, even one that might have been rare, can become more common. In this way, populations adapt to their environments. Biologists refer to this as natural selection.
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