How many sperms are formed from $4$ primary spermatocytes?

Spermatogonia undergo a series of cell divisions to produce sperms. Select the correct statements from the following:
$A$. Spermatogonia always undergo meiotic cell division.
$B$. Primary spermatocytes divide mitotically to produce secondary spermatocytes.
$C$. Secondary spermatocytes,through their second meiotic division,produce spermatids.
$D$. Spermatids produce spermatozoa through mitosis.
$E$. Spermatids transform into spermatozoa by spermiogenesis.
Choose the correct answer from the options given below:

$A$: In spermatogenesis,the first haploid forms are spermatids.
$R$: At the end of meiosis,cells have a haploid set of chromosomes.

Describe the process of spermatogenesis with a labelled diagram.

Microlecithal eggs are found in

The fluid-filled cavity called the $Antrum$ is found in which of the following?