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As millions of sperm flood the reproductive tract,

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only a few 100 of them will even reach the area where the egg is.

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And typically only one will actually make contact after it penetrates

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their genetic materials merge forming a new cell called a zygote.

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The zygote divides multiple times as it travels

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down the fallopian tube towards the uterus.

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Now,

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a multicellular embryo implants itself in the lining of

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the uterus and begins to develop into a baby.