If only a small volume of sperm is discharged into the vagina,an insufficient amount of enzymes might be released when they encounter the ovum.In that case,pregnancy would probably not result,because:

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If only a small volume of sperm is discharged into the vagina, there may not be enough to successfully fertilize the ovum. This is because sperm must penetrate through the zona pellucida of the ovum in order to fertilize it, and a lack of sufficient enzymes released from the small volume of sperm may make this difficult or impossible. The other options (A, B, and C) are unrelated to this specific issue and do not provide a likely explanation for why pregnancy might not result.

If Only a Small Volume of Sperm Is Discharged into the Vagina,an