In non-primate mammals,when does ovulation occur?

Androgen stimulates the $...A...$ $FSH$ acts on the $...B...$ and stimulates factors for spermiogenesis. Here $A$ and $B$ refers to

Identify the cells represented as $p$,$q$,$r$,and $s$ in the schematic representation of Oogenesis shown below and choose the correct option.

The formation of polar bodies occurs during the formation of which of the following?

In the testis,the immature germ cells produce sperm by $...A...$ at puberty. $...B...$ present on the inside wall of seminiferous tubules multiply by $...C...$ division and increase their number. Identify $A$,$B$,and $C$ from the above statement.

Describe the structure of a sperm.