According to the chapter, what is stated about "Change of voice" in Adolescence And Growth?
Change of voice in boys is a sign of adolescence.n n (Yes/No/Don't know) III.
This is called growth spurt and is shown through the following flow chart.
The peak of growth of muscle mass is also typically around the age of 14 to 16 years.
Sex hormones stimulate growth and maturity of gonads (reproductive organs).