In most of the mammals,the testes are situated outside the abdominal cavity because

  • A
    Sperms produced in the scrotal sac are more in number
  • B
    Sperms produced in the abdominal cavity are provided with less motility
  • C
    Sperms produced in the scrotal sac require a lower temperature for their optimal fertilization capacity
  • D
    Sperms produced in the scrotal sac are bigger

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Seminal plasma in human males is rich in

$A$: Failure of testes to descend into the scrotum causes sterility in man. $R$: Higher internal body temperature is not suitable for sperm development.

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