When bilogists think about selective pressure in evolution, they tend to focus on environmental concerns such as weather, temperature, or geographic features in a particular locality.

　
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  • 當生物學(xué)家考慮進(jìn)化中的選擇壓力時(shí)，往往把重點(diǎn)放在環(huán)境問(wèn)題上，比如某特定地區的天氣、溫度、或者地理特征。
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