动物的买卖主要是基于它们的遗传基因和繁衍历史。
Animals are bought and sold on the basis of their genetics and breeding history.
反过来，这使得恐龙灭绝而为哺乳动物的出现和繁衍开辟了道路提供了条件。
That, in turn, wiped out the dinosaurs and made way for the rise of mammals.
对于大多数动物物种这样的个体很小可能幸存和繁衍。
For most animal species such individuals are less likely to survive and reproduce.
对于大多数动物物种这样的个体很小可能幸存和繁衍。
For most animal species such individuals are less likely to survive and reproduce.
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