Well in virtual you are online and in person you are there and face to face with people
Answer: the atrioventricular heart valve open and closed imcubent on different blood pressure on both sides.
Because if they have sexual intercourse with a condom the egg inside you won’t get fertilized and become your period if they have sexual inter course without a condom the egg will be put together with the spent and fertilize the egg and become a baby
