The answer is c (I think)
<span>Forced expiratory volume is the percentage of the vital capacity that can be expelled in a specific period of time. This value is obtained by inspiring as much air as possible and then expelling the air from the lungs as quickly as possible. Individuals with decreased ability to expire typically exhibit decreased FEV values. Maximum voluntary ventilation is the greatest amount of air that can be taken into, and then expelled from, the lungs</span>
1.ultraviolet (UV) rays
2.gamma rays
3.ferrous salts
4.mustard gas
5.X-rays
6.caffeine
Its the study of living organisms.
