PLEASE HELP
1. What is puberty? Are the first changes of puberty visible? What are they?
2. What is the average age that girls start puberty? When do physical changes usually appear?
3. What is the average age that boys start puberty? When do physical changes usually appear?
4. What kinds of non-physical changes may occur during puberty?

puberty is physiological changes of the body preparing him to be able for fertilizing the other sex ( to form the next generation of the species)

First changes include appearance of pubic and axillary hair

Average Age of puberty For boys 12-14 years and for girls 14-16 years

Explanation:

i am 100% sure that michael won medal in five different olympics.

fluid balance is an aspect of the homeostasis of organisms in which the amount of water in the organism needs to be controlled, via osmoregulation and behavior, such that the concentrations of electrolytes (salts in solution) in the various body fluids are kept within healthy ranges. the core principle of fluid balance is that the amount of water lost from the body must equal the amount of water taken in.