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

The correct answer is 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.

Primary succession is one of two types of biological and ecological succession of plant life, occurring in an environment in which new substrate devoid of vegetation and other organisms usually lacking soil, such as a lava flow or area left from retreated glacier, is deposited.