The breakage of the membrane surrounding the acrosome in a mammalian sperm is known as:

How does a sperm differ from an ovum?

The Graafian follicle ruptures to release . . . . . . from the ovary by the process called ovulation.

Immediately after ovulation,the mammalian egg is covered by a membrane. What is this membrane called?

The mother germ cells are transformed into a mature follicle through a series of steps. Provide the missing steps in the blank boxes.
$\boxed{\text{Oogonia}} \to \boxed{A} \to \boxed{\text{Primary follicle}} \to \boxed{B} \to \boxed{C} \to \boxed{\text{Mature or Graafian follicle}}$

Holoblastic cleavage may occur in eggs which are