A human male ejaculates about 200-300 million sperms during a coitus of which for normal fertility at least 60% sperms must have normal shape and size and at least 40% of them must show vigorous motility. EXPLAIN.

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The given statement means that human males produce about 200-300 million sperms per ejaculation. Among these 200-300 million sperms, 60% (120-180 million) sperms should have normal shape and size i.e should be healthy. Among the 60% (120-180 million) sperms with normal shape and size, 40% (72-108 million) sperms should show vigorous motility to reach the fallopian tube for successful fertilisation. 

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