Fertilization in humans,rabbits,and other placental mammals occurs in:

In humans,fertilization is possible only when,

In the blastocyst,the blastomeres are arranged into an outer layer called _ $A$ _ and an inner group of cells attached to the trophoblast,called _ $B$ _.

Cleavage is found in

Which centriole of spermatozoa is required for the first cleavage?

Corpus luteum secretes.....