Not all copulations lead to fertilisation and pregnancy in humans because

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female releases only one ovum but male releases millions of sperms in a coitus

fertilisation can only occur if the ovum and sperms are transported simultaneously to the ampullary region

only one Graafian follicle matures per month in females

sperm released by the penis may or may not enter into the uterus

answer is B.

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Detailed Solution

In humans fertilisation can only occur if the ovum and sperms are transported simultaneously to the ampullary region.

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