Which of the following changes occur in the fetus after $24$ weeks of gestation?

Placenta is present in

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

Foetal ejection reflex in human female is induced by

The substance secreted by the corpus luteum is

During pregnancy,which one of the following is excreted?