Which is an example of how exercise enhances health and well-being? a. creates hormonal balance b. increases cortisol levels c. increases dopamine levels d. decreases endorphin levels

Hand washing is an important behavior that can cut down your chances of becoming sick with a communicable disease. select the best answer from the choices provided. t f

Antibiotics are given when an std is caused by a virus. true or false

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.