Answer:The answer is A
Explanation:I have had the question before
It depends on which macromolecule you are referring to. As examples:
Protein monomers are amino acids.
DNA monomers are nucleotides.
Carbohydrate monomers are monosacharides.
Lipid monomers are fatty acids and glycerol.
From the right atrium, blood will flow through the tricuspid valve into the right ventricle.