when faced with a chenge in environmental condi-tions a population of a species has three possibilities: adapt to the new conditions through natural selection migrate to an area with more
favorable conditions or become extinct
當環境變遷時 ㄧ個物種有三種可能性來面對這 重大的改變
一種是經由天擇 適者身存 不適者淘汰 來適應環境
其次是遷移到適合的環境 繼續身存
再來就只好絕種 退出地球這個舞台
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