Why does fertilisation not occur during pregnancy? (a) Secretion of high levels of oestrogen and...

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Why does fertilisation not occur during pregnancy?
(a) Secretion of high levels of oestrogen and progesterone
(b) Woman cannot have intercourse during pregnancy
(c) High level of \( \mathrm{HCl} \) kills the ovum
(d) An abnormal ovum is released during pregnancy
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