13 select the correct answer. george complains of pain in the lower back. which type of vertebra is likely to be affected? a. lumbar vertebrae b. thoracic vertebrae c. cervical vertebrae d. coccyx e. sacral vertebrae

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.