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The father starts the process by having sex and provides half of the necessary genetic material. Ideally, the father also takes care of the mother and helps provide the financial and environmental needs for raising a child. Sperm cells and egg cells each have 23 chromosomes. Human life requires forty-six chromosomes. So a sperm cell from the man is required to start the process of reproduction. Twenty-three of his chromosomes and 23 of hers make the required 46.

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