The stroma of the ovary consists of nerves, blood vessels, muscle fibres and a type of protein called

Both corpus luteum and macula lutea are

Umbilical cord in mammals, contains

$A$ : 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

Blastopore is found in

Name $A, B, C$ chormones in the given figure