Physical activity is like walking a dog and just doing day to day things with not alot of effort.
If we do not asses our environment, our risk of sickness and disease increases. Any kind of chemical or radiological substances in the air are exposures that can affect our health. Meaning that the air we breathe, foods we eat, the water we drink from, and the products we use can sicken us if they aren't properly cleaned or pure.
Ergonomic .........................
B: enzyme because a substance produced by a living organism that acts as a catalyst to bring about specific biochemical reaction
