Observe the given figure carefully and identify the site of fertilization by considering the parts labeled as $a, b, c,$ and $d$.

Explain the primary concept of the male and female reproductive systems.

The female rabbit is:

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: Endometrium is necessary for implantation of blastocyst.
Reason $R$: In the absence of fertilization,the corpus luteum degenerates that causes disintegration of endometrium.
In the light of the above statements,choose the correct answer from the options given below:

Choose the correct pair:

Column-$I$	Column-$II$
$(A)$ Myometrium	$(1)$ Cushion of fatty tissue
$(B)$ Mons pubis	$(2)$ Tiny finger-like structure
$(C)$ Acrosome	$(3)$ External layer of uterus
$(D)$ Prostate gland	$(4)$ Middle thick layer of uterus
	$(5)$ Help in fertilization of ovum

Given below are the events in human reproduction. Write them in correct sequential order: Insemination,gametogenesis,fertilisation,parturition,gestation,implantation.