Which type of placenta is present in the early human embryo?

$A$: The first sign of a growing foetus may be noticed by listening to the heart sound through the stethoscope.
$R$: By the end of the second month of pregnancy,the foetus develops limbs and digits.

Which of the following is $NOT$ true for the blastocyst?

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

The first movements of the foetus and appearance of hair on its head are usually observed during which month of pregnancy?

In humans,all three germ layers originate from: