Why are menstrual cycles absent during pregnancy?

Menstrual cycle ceases during pregnancy .

Menstrual cycles are absent during pregnancy. Why?

Identify True/False statements, Correct each false statement to make it true: Menstrual cycle ceases during pregnancy. (True/False)

Identify True/False statements: Menstrual cycle ceases during pregnancy.

Menstrual cycle is ceased during pregnancy is due to negative feedback of :

Menstrual cycle ceases during pregnancy. (True/False)

Menstrual cycle ceases during pregnancy. (True/False)

Menstrual cycle ceases during pregnancy. (True/False)