The function of the allantois in mammals is:

In the second trimester of pregnancy,there is a decline in the level of . . . . . . .

Relaxin (a hormone) is secreted by

What type of placenta is found in humans?

Select the mismatched pair:
$A$. First month of pregnancy - Formation of heart
$B$. Second month of pregnancy - Movement of foetus
$C$. Third month of pregnancy - Formation of most of the major organ systems
$D$. Sixth month of pregnancy - Eye lids separate and eye lashes are formed

What is the process of gastrulation?