The eutherian placenta is derived from or In mammals placenta is formed by
Yolk sac
Amnion
Allantois
Chorion allantois
Implantation or uterine attachment of the blastocyst presumably occurs between
Which of the following structure originates from ectoderm
Meroblastic cleavage refers to which type of division of egg
The placental barrier between the maternal and foetal blood is minimum in
In mammals the estrogens are secreted by the Graafian follicle from its