Question

I don't know ( voice change )​

Answer 1

Answer:

This is not known by me.

Answer 2

Answer:

this is due to puberty

Explanation:

Puberty is the period of sexual maturation and achievement of fertility.

The time when puberty begins varies greatly among individuals; however, puberty usually occurs in girls between the ages of 10 and 14 and between the ages of 12 and 16 in boys.

Both genetic and environmental factors are involved in the timing of puberty.

Body fat and/or body composition may play a role in regulating the onset of puberty.

Puberty is associated with the development of secondary sex characteristics and rapid growth.