$A$ : The most immediate effect of $FSH$ is the maturation of existing late primary or secondary follicle.
$R$ : $A$ rising level of $FSH$ causes the developing egg within the follicle to complete the first meiotic division to form a secondary oocyte.

Vasa deferentia together with seminal vesicle forms

The period of preparation with reference to developmental phenomena in vertebrates means

Embryo at $16$ -celled stage is called

Which of the following structure is lacking from the placenta