As Charles Darwin observed, natural selection operates whenever individuals of one genetic composition are better at reproducing than that of others.
that of others
the other
another
those of another
that of the next
登录 或 注册 后可以参加讨论
原句是individuals of one genetic composition, 所以比较个体们中的不同，individuals可以用those代替，只有D对。
扫描二维码，直接登录
原句是individuals of one genetic composition, 所以比较个体们中的不同，individuals可以用those代替，只有D对。
登录 或 注册 后可以参加讨论