Where do viruses come from

Viruses evolved from complex molecules of nucleic acid and proteins around the same time as the first cells appeared on Earth. A virus is a small, infectious agent that replicates only inside the living cells of an organism, they can infect all types of life, from plants to animals to microorganisms (including bacteria and archaea).

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nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides

the correct answer is b