According to conventional thinking, simple animals, including sponges, jellyfish and corals, evolved step-by-step in a linear fashion into those with more complex bodies, such as mammals.

 
  • 按照传统的见解,包括海绵、水母和珊瑚在内的简单动物按部就班发生演变,以线性方式形成像哺乳动物一样的更加复杂的生物体。
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