Question

why do so many things change at once during puberty​

Answer 1

Explanation:

During puberty, your body will grow faster than any other time in your life, except for when you were an infant. Back then, your body was growing rapidly and you were learning new things — you'll be doing these things and much more during puberty.

Answer 2

It’s to due to the hormonal changes in the body, testosterone in males, progesterone and estrogen is females