What is the chemical composition of proteins, fats, and carbohydrates?

Here is the chemical composition of the requested substances:

a) Proteins: Proteins are polymers made up of repeating units called amino acids. Each amino acid contains carbon, hydrogen, oxygen, and nitrogen, and sometimes sulfur.

b) Fats: Fats (lipids) are composed of fatty acids and glycerol. A typical fat molecule (triglyceride) consists of three fatty acid molecules attached to one glycerol molecule.

c) Carbohydrates: Carbohydrates are made up of simple sugars (monosaccharides) or chains of simple sugars. Their basic chemical composition includes carbon, hydrogen, and oxygen, typically in a ratio of $1:2:1$ for hydrogen and oxygen.