Extrusion of the second polar body from the egg nucleus occurs:

$A$ - Spermatids are formed from secondary spermatocytes.
$R$ - The spermatids are transformed into spermatozoa by the process called spermiogenesis.

Which part of the given diagram contains enzymes necessary for fertilization?

Who discovered human sperm?

Which type of cell division forms spermatids from the secondary spermatocytes?

The question asks for a diagrammatic presentation of developing follicle events in the human ovary. Based on the standard biological sequence of ovarian follicle development:
$1$. Primary follicles develop into secondary follicles.
$2$. Secondary follicles develop into tertiary follicles.
$3$. Tertiary follicles develop into the Graafian (mature) follicle.
$4$. After ovulation, the ruptured follicle transforms into the corpus luteum.
Given the standard sequence, identify the correct labels for $C$ and $E$ in a typical diagram of this process.