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The difficult journey of the sperm
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The journey of egg and sperm. There are a lot of casualties (deaths) among the sperm as they swim toward the egg. First, many get lost in the maze of a woman's uterus where they also have to contend with acidic vaginal secretions.
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1 Просмотры · 09/08/25
31 Просмотры · 03/13/25
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