Which substance is a nucleic acid? a.)amino acid b.)fat c.)polysaccharide d.)rna

D.RNA is the correct answer.

Explanation:

RNA is present in living cells, and RNA is considered has as the first nucleic acid.

RNA molecule - first nucleic acid to carry the heredity information.

RNA's function: to store and express the genetic information before DNA enter the system.

RNA is a single strand, which controls protein synthesis and gene expression.

Thus RNA substance is a nucleic acid.

your answer is rna to the question.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus. this is so because calcium carbonate is the main component in the shells.

explanation: