Why and how does certain body hair stop growing after a certain length?

Why and how does certain body hair stop growing after a certain length?
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1 Answer

Answer :

I think it is kind of programmed to fall out at a certain length. The hairs go through the different phases of growth. I don’t think hair really “stops” growing per se. It’s more like it grows and eventually falls out, but there is a constant amount of new hairs replacing, and growing, and falling out. Eye lashes only have a short time in the growing stages, under your arm a little longer, hair on your head more time.
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