Which of the following secretes the hormone relaxin during the later phase of pregnancy?

The type of placenta in humans is:

Placenta is present in

In which month of gestation,the first movements of the fetus and the appearance of hair on its head are observed?

Major features of embryonic development at various months of pregnancy are given below. Choose the correct option for the correct sequential events.
$(i)$ The first movements of the foetus
$(II)$ The foetus develops limbs and digits
$(III)$ The embryo's heart is formed
$(IV)$ The body is covered with fine hairs

During cleavage,which of the following is true for the embryo?