The fluid filled in the blastocoel cavity of blastula is

Which is not the function of placenta?

Mesoderm gives rise to all the structures except

The unit cell of a blastula is known as:

$A$: If fertilization occurs,the corpus luteum is rescued from regression by human chorionic gonadotropin $(hCG)$,which is produced by the placenta.
$R$: In the first trimester,the corpus luteum,stimulated by $hCG$,is responsible for the production of progesterone.

Which of the following structures forms the birth canal after fertilization?