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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. 就拿海洋中的微小動物蛭形輪蟲來說，大部份輪蟲行有性生殖，但是蛭形輪蟲已經把性丟開約一億年了。