Between 2000 and 2019, expanded vaccination saved 37 million lives, out of which 36 million were children under 5. Why do you think that is? We will probably only see the impact of expanded vaccination against human papillomavirus (HPV) after 2030. Why?

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.