$A$ phenomenon of embryonic induction was first described in amphibia by

The first sign of the growing foetus may be noticed by listening to the heart sound carefully through the stethoscope. The embryo's heart is formed after one month of pregnancy. Which of the following gestation periods is correctly matched?

Which hormone is produced only in the female body during pregnancy by the placenta?

Which is not the function of placenta?

The extra-embryonic membranes of the mammalian embryo are derived from

Which of the following hormones plays a crucial role in the maintenance of pregnancy?