The body absorbs monomers, the building blocks of larger biological molecules. Here's a breakdown of the main types:

* Carbohydrates: The body breaks down complex carbohydrates (like starch) into monosaccharides (simple sugars) like glucose, fructose, and galactose.

* Proteins: Proteins are broken down into amino acids.

* Fats (Lipids): Fats are broken down into fatty acids and glycerol.

* Nucleic Acids: These are broken down into nucleotides, which are composed of a sugar, a phosphate group, and a nitrogenous base.

The body uses these absorbed monomers to build its own complex molecules for energy, structure, and function.