Notochord,skeletal system and dermis of the skin are the derivatives of

Placenta acts as an endocrine tissue and produces several hormones like:
$A.$ Human chorionic gonadotropin $(hCG)$
$B.$ Human placental lactogen $(hPL)$
$C.$ Estrogens
$D.$ Progesterone

The first sign of a growing fetus can be noticed by:

$A$: Placenta is connected to the embryo through an umbilical cord which helps in the transport of substances to and from the embryo.
$R$: Placenta acts as an endocrine tissue.

In human beings,at the end of $12$ weeks (first trimester) of pregnancy,which of the following is observed?

Pseudopregnancy is a physiological condition comparable to normal pregnancy except that there is no