Question

boy starts developing facial hair.. give reason​

Answer 1

Answer:

In teenage boys, facial hair grows thick and darkens because of the effect of testosterone. That's the male sex hormone. When boys enter puberty, their testicles begin producing more testosterone. ... Getting a beard is one of the changes brought about by this hormone.

Answer 2

IT'S A PART OF THE LESSON

AT THE AGE OF ADOLESCENCE

In teenage boys, facial hair grows thick and darkens because of the effect of testosterone. That's the male sex hormone. When boys enter puberty, their testicles begin producing more testosterone. ... Getting a beard is one of the changes brought about by this hormone.