ANSWER
Mixture
Explanation: the air is composed of nitrogen and oxygen
Answer:w has the new potato GMO been used to solve the problem of feeding the changing population?
Explanation:
Answer: Tidaling
Explanation:
It is rise and fall of water in water-seal chamber, used to determine the degree of re expansion of the lungs. It reduction shows the lungs reexpands.
However, with respiratory efforts it is normal.