... by extinction,the population may fall below a minimum whereby the forced interbreeding between the remaining animals will result in extinction. P.S . 這篇文章解釋很清楚,應該都回答了你...
...movement of set of alleles from one place to another. 2006-03-19 03:58:38 補充： In conclusion, these different forces you mention are not all acting in the same direction. But they all...
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