The placenta in mammals is derived from which of the following?

Choose the $CORRECT$ group of labelling.

Which of the following statements is true regarding cells during cleavage?

Match List-$I$ with List-$II$ related to embryonic development at various months of pregnancy:

List-$I$	List-$II$
$A$. The foetus movement starts and hair appears on the head	$I$. $24$ weeks of pregnancy
$B$. The foetus develops limbs and digits	$II$. $20$ weeks of pregnancy
$C$. The foetus develops external genital organs	$III$. $8$ weeks of pregnancy
$D$. The foetus body is covered with fine hair; eyelids separate and eyelashes are formed	$IV$. $12$ weeks of pregnancy

Choose the correct answer from the options given below:

$A$: 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.

Some hormones like $hCG$,$hPL$,estrogens,and progestogens are produced by which of the following?