Question

list four conditions required exchange of gas in human

Answer 1

axchanges of gas is importante for respiration which involve the uptake of oxygen and released of carbon dioxide .....
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Answer 2

1) increased respiratory surface area
2)very fine and delicate surface for easy exchange of oxygen and carbon dioxide 
3) placement of respiratory surface within the body for protection and hence special passages are present so that the air could make it easy entry and exit
4) mechanism for moving the air in and out of the respiratory surface
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