3,006 意见 · 01/17/24
The difficult journey of the sperm !
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3,237 意见·
01/17/24
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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3,006 意见 · 01/17/24
