Amit was very good in study. But as he attained the age of 13 years, he became dull and lethargic.
Asked by his teacher, Amit told that he is very worried about the changes that are taking place in his body such as hoarse voice, height, etc. The teacher smiled and explained that it is a normal process of growing up.
(i) Mention some of the changes that Amit must be going through.
(ii) What is this special period of life known as ?
(iii) Can you explain the reason of his hoarse voice ?