Protons and neutrons have different charges and vastly different masses.

different charges but essentially the same mass.

the same charge and essentially the same mass.

the same charge but vastly different masses.

as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.