Hi there! I just finished studying the human body and so I can tell you with confidence that the Respiratory System is responsible for the exchange of oxygen and carbon dioxide. If you need more proof, the word Respiration itself<span> means</span> the action of breathing.
Organic food is the product of a farming system which avoids the use of man made fertilizers,pesticides;growth regulators and livestock feed additives.
In other words, It's a pure food
I think the answer may be D.
