Write a paragraph to answer the following question.5 sentences
why is it important to understand the concept of optimal challenge
when setting goals? provide an example to you make your point.

Why do rna viruses appear to have higher rates of mutation? a) rna nucleotides are more unstable than dna nucleotides. b) replication of their genomes does not involve proofreading. c) rna viruses can incorporate a variety of nonstandard bases. d) rna viruses are more sensitive to mutagens.