Progesterone is

  • A
    An enzyme for digesting proteins
  • B
    $A$ hormone to initiate uterine contraction during child birth
  • C
    An amino acid which may cause alcaptonuria
  • D
    $A$ hormone concerned with retention and growth of pregnancy

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$R$: By the end of the second month of pregnancy,the foetus develops limbs and digits.

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The allantois has the similar layers as present in the yolk sac. These are

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