How many chromosome numbers are present in primary spermatocytes of human ?

Fleshy folds of tissue which extends down the mons pubis and surrounds the vaginal opening is called

Chorion is composed of

Formation of notochord or the central axial chord in vertebrates is known as

During the development, the point of entry of sperm in the eggs at fertilization

Give the name of two hormones $A$ and $B$ in the figure given below