How does animal fur "know" to stop growing at a certain length? Human hair never stops growing but animal fur stops at certain lengths (most of the time). How does it know?
Note: tried to post in ELI5 but it wouldn't let me. If I need to post under another sub, I can. Thanks.
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from Pets https://www.reddit.com/r/Pets/comments/f8p371/animal_fur/
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