At what age do boys typically reach puberty?

Which method of asexual reproduction occurs in $Amoeba$?

During adolescence,several changes occur in the human body. Mark one change associated with sexual maturation in boys.

Which of the following organisms reproduces through regeneration?

Which of the following is a characteristic of asexual reproduction?

$A$ part of the male reproductive system is shown below. Study the diagram and answer the questions that follow.
$(a)$ Two parts have been incorrectly labelled. Identify them.
$(b)$ Give the function of urethra.
$(c)$ Which hormone is released by testis?