Take a lineage of microscopic marine animals known as bdelloid rotifers.Most rotifers reproduce sexually, but bdelloid rotifers abandoned sex about 100 million years ago.

 
  • 就拿海洋中的微小动物蛭形轮虫来说,大部份轮虫行有性生殖,但是蛭形轮虫已经把性丢开约一亿年了。
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