Which cell is responsible for carrying oxygen throughout the body?

How is foul play dealt with in sports?

Which foods are categorized as foods you should "eat less of" on the food label?

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.