1.Air contains about 20 percent of oxygen .2.Every body in our body gives Life to The body as a whole.3. when any organ is not working properly it's Effects will take up The oxygen needed for The cells.4.when we breathe ,The oxygen in The air Reaching The chest passes out Through The air From The carbondioxide produced by The body.5. The blood cells work hard to prevent The disorders in our body caused by microorganisms. 6.Respiratory disorders are caused by many disorders,where oxygen supply is also damaged by The body. Editor: Akki- viswanadh ............