People addicted to smokeless tobacco can develop thick, leathery white spots in the mouth. what are these spots called? a. emphysema b. leukoplakia c. mouth ulcers

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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.