<span>Animals with a monogastric digestive system are able to digest and use a high percentage of the fats and proteins that they take in from their foods and therefore exhibit high levels of energy.</span>
I think b. Proteins are polymers of amino acids is the correct answer
Biomolecules include large macromolecules (or polyanions) such as proteins, carbohydrates, lipids, and nucleic acids, as well as small molecules such as primary metabolites, secondary metabolites, and natural products. A more general name for this class of material is biological materials.
