Give reasons for the following:
Sudden increase in height around 14 years of age.
Adolescence:
Give the reason for sudden increase in height around 14 years of age.
Give an appropriate biological/technical term for the following:
Onset of menstruation in a young girl around the age of 13 years.
"Pranay suffered from measels at the age of 10 years. There are rare chances of his getting infected with the same disease for the rest of his life". Give reasons for the statement.