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Sperm that enter uterus quickly swim to the Fallopian tubes.

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If an ovum is present, the sperm swarm the ovum and try to break through the surface.

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In most cases, only one sperm is successful.

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At fertilization, the sperm seals out the remaining sperm, which eventually die.

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Male and female reproductive cells unite after sexual intercourse.

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Once the ovum has been fertilized, it attaches to the wall of the uterus.

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Menstruation stops until the pregnancy is over.

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The male determines the sex of the child.