- Spermatozoa crossing extremely long way
Since spermatozoa are not bigger than 0,6 mm, they always need to pass a long way (for them) of about 15 cm in order to get to the egg. Compared to human`s measurements, that would mean- a person from 1,80 m to pass a hike route of 5,5 km, which I quite a long distance.
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