Why are fads sometimes referred to as crazes?

Warming up prepares the body for exercise in what way? a. muscularly b. cardiovascularly c. neurologically d. all of the above

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.

How can a friend directly influence you to buy a health product? he tells you to buy it because of how good the product is. ob. you hear him exclaim how great this product is. c. you see this post on a social networking site saying how much he likes it reset next