Which of the following is not a benefit of strength training ?

improves focus and concentration.

improves your cardiovascular health significantly.

reduce body fat and increase muscle mass.

burn more calories when not exercising.

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.