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      Human Fertilization . 500,000,000 sperm cells race to fertilize with ovum but 1 in 500,000,000 sperm cells can complete fertilize.

      "Human Fertilization" 500,000,000 sperm cells race to fertilize with ovum but 1 in 500,000,000 sperm cells can complete fertilize.
      Human Fertilization . 500,000,000 sperm cells race to fertilize with ovum but 1 in 500,000,000 sperm cells can complete fertilize.

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