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

  • A

    Sperms produced in scrotal sac are more in number

  • B

    Sperms produced in abdominal cavity are provided with less motility

  • C

    Sperms producd in scrotal sac require lesser temperature for their best fertilization capacity

  • D

    Sperms produced in scrotal sac are bigger

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