The macromolecules such as carbohydrates, fat and protein provide energy to the body. Each and every cell of the human body needs energy to perform its function.
Carbohydrates provide maximum energy and instant energy to the cells of the body. The first macromolecule that provides energy is carbohydrates, then second is fat and third is protein.
all the law is saying is that matter cant be created nor destroyed, so if 18 oxygen atoms are used, there will be 18 oxygen atoms in the end, no matter what, doesn't matter what they use it for or what
