For normal fertility,at least ....... of the sperm in a human ejaculate must have normal shape and size,and at least ...... of them must show vigorous motility.

  • A
    $60\%, 40\%$
  • B
    $70\%, 30\%$
  • C
    $80\%, 20\%$
  • D
    $75\%, 25\%$

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