Well I cannot actually see any reasons,so I might as well just give my own.A drug might not recieve FDA approval because they need to find the good chemicals and the bad chemicals in the drug.If they find any bad chemicals in the drug,they will not approve it.Hope this helps!!!!
Aerobic system is predominantly used during medium to low intensity activity. The predominant energy system being used at rest is the aerobic system.
I believe this would be hypochondria.
