3,006 ビュー · 01/17/24
The difficult journey of the sperm !
0
0
3,237 ビュー·
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.
もっと見せる
0 コメント
sort 並び替え
3,006 ビュー · 01/17/24
