How do hips of girls change during puberty?

A nine year old boy is 120 cm tall. If the present height of boy is 75% of his full height, calculate the full height which the boy will eventually reach at the end of growth period.

How do shoulders and chest change in boys during puberty?

What is the other name of ‘voice box’?

Which of the two have a smaller voice box: grown up boys or grown up girls?