The gastrula stage is characterized by which of the following?

After which stage does cleavage stop?

Identify the structure shown in the process of human embryonic development.

Foetal sex can be determined by examining cells from amniotic fluid by looking for:

At which stage of embryonic development do the cells migrate to form the germ layers?

Find the correct statements :
$A.$ In human pregnancy,the major organ systems are formed at the end of $12$ weeks.
$B.$ In human pregnancy the major organ systems are formed at the end of $8$ weeks.
$C.$ In human pregnancy heart is formed after one month of gestation.
$D.$ In human pregnancy,limbs and digits develop by the end of second month.
$E.$ In human pregnancy the appearance of hair is usually observed in the fifth month.
Choose the correct answer from the options given below.