Explain the role of forest in maintaining the balance between oxygen and carbon dioxide in the atmosphere.

Explain the role of oxygen in respiration

Explain the role of oxygen in explosion

What is the partial pressure of oxygen and carbon dioxide in atmospheric air ?

Comment upon the role of ear in maintaining the balance of the body and posture.

Which of the following microorganisms play important roles in maintaining the balance of nitrogen gas in the atmosphere?

Is the presence of carbon dioxide necesaary in the atmosphere ?

Explain the role of oxygen in cutting and welding