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
①"natural selection operates" 复数 ②one...another...固定搭配
扫描二维码，直接登录
①"natural selection operates" 复数
②one...another...固定搭配
登录 或 注册 后可以参加讨论