a, because exercise doesn't just aid the prevention of certain diseases, it helps prevent many diseases. i would've chosen d if it wasn't so specific but a is the correct answer.
It depends on how fit/active they are but there is no set amount I would say at least 10
1. What it will do to help
2. Possible side-effects
3. How long this person will be taking it.
<em>True</em> or False? If tolerance develops to the effects of one drug, often tolerance also develops to other similar drugs.
