One reason people are fat is because they eat and eat and eat and don't exercise. Another reason is because some people have fast working calorie burning systems and some people have slow ones causing them to be fat.
It might be that those people that are not fat have high metabolism you eat as much as you want and not get fat.
Hydrogen Bond
This is it
DNA and RNA are made up of nucleic acids.
It is the part of the atom with the greatest mass.
A membrane protein is transporting substances. APEX
Magnesium and bromine (Apex)