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sonalidmg

Oxygen and Carbon dioxide

Oxygen and carbon dioxide are present in air.OXYGEN IS SUPPORTER OF COMBUSTION AND CARBON DIOXIDE extinguishes the fire.Also they are essential for animals and plants life. 1) If the percentage of...
09:25 Fri 29th May 20091 answer, last by DaThinker 23:43 Thu 16th Jul 2009

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