In the early haemopoietic tissue of the embryo,there is:

Select the correct option describing gonadotropin activity in a normal pregnant female.

$A$: Blastocyst undergoes gastrulation to produce the three germinal layers.
$R$: This involves cell movements (morphogenetic movement) that eventually help to attain new shape and morphology of embryo.

What is placenta? Give information about hormones produced by the placenta.

The extra structure that provides nutrition to the embryo is

The given figure shows the human foetus within the uterus with few structures marked as $A, B, C$ and $D$. Which of the following options shows the correct labeling?