A machine gun has a mass of 20 kg. It fires a 35 g bullet at the rate of 400 bullets per minute with a speed of 400 m/s. What force must be
applied to the gun to keep it in position?

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds

cell division is not regulated in tumor cells.

well the answer is 2!