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A mature sperm cell meets and penetrates an egg, starting the fertilization process.

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The genetic material from the sperm and egg fuse together, creating a single cell called a zygote.

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The zygote starts dividing rapidly into many smaller cells.

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The ball of cells continues to develop, forming a hollow structure called a blastocyst with an inner cell mass.

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The blastocyst travels down the fallopian tube and implants itself into the lining of the uterus, where pregnancy begins.