Question

If mass can neither be created nor be destroyed,then when a foetus develops and a baby borns then new mass is created,how???​

Answer 1

A sac filled with amniotic fluid, called the amniotic sac, surrounds the fetus throughout the pregnancy. The amniotic fluid is liquid made by the fetus and the amnion (the membrane that covers the fetal side of the placenta) that protects the fetus from injury. It also helps to regulate the temperature of thefetus.

Answer 2

Explanation:

Among other things, it can explain well-known birth defects of the brain or the nervous system ... The human brain develops from the tip of a 3 -millimeter ... Mass Production of Brain Cells.