The gestation period in human beings is about:

In a normal pregnant woman,the amount of total gonadotropin activity was assessed. The result expected was

Which process is necessary for the development of an embryo from a zygote?

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

Which of the following structures is lacking in the placenta?

The blastula stage lacks which of the following?