In my opinion it is tears.
Explanation:
ADP is composed of 2 phosphate groups bonded to 5 carbon atoms of ribose
glucose or sugar backbone attached to Adenine.
The answer is B.
A macromolecule is a large molecule containing many atoms. The four type are carbohydrates, lipids, proteins, and nucleus acids.
THIS TYPE OF RELATIONSHIP IS CALLED "COMMENSALISM"