Usually more than one sperm can successfully enter an ovum.
Only one sperm can enter an ovum.

Name: Usually more than one sperm can successfully enter an ovum. Only one sperm can enter an ovum.
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Quizplus · Accepted Answer

Only one sperm can enter an ovum during fertilization. This is known as the acrosomal reaction, where the membrane of the ovum changes to prevent other sperm from entering. Multiple sperm fertilizing the same ovum can lead to genetic abnormalities and is considered rare.

Usually More Than One Sperm Can Successfully Enter an Ovum