Why do all copulations not lead to fertilisat | vedclass

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(C) Fertilization can only occur if the ovum and sperms are transported simultaneously to the ampullary-isthmic junction.The lifespan of sperm in the

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Ovum and sperms are not transported simultaneously to the ampullary-isthmic junction

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(C) Fertilization can only occur if the ovum and sperms are transported simultaneously to the ampullary-isthmic junction.The lifespan of sperm in the female reproductive tract is approximately $48$ to $72$ hours.The viability of the secondary oocyte after its release from the ovary is only about $24$ hours.Therefore,if copulation does not occur during the fertile period when both gametes are viable,fertilization and subsequent pregnancy will not take place.

Why do all copulations not lead to fertilisation and pregnancy? The root cause is . . . . . . .

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