The longest gestation period is found in

$I. $ Sperm cells immediately when they are released from the body and are placed in a petri plate remain alive for much longer duration.

$II.$ Semen contains chemicals that causes females smooth muscles to contract

The corpus luteum secretes progesterone which negatively feeds back and inhibits the release of

A blastula which is solid, is known as

Bartholin’ s glands are situated

After implantation, finger-like projections on the trophoblast are called $...A....$ which are surrounded by  $...B..$ and maternal blood. Here $A$ and $B$ refers to