Answers

2015-09-29T19:16:51+05:30
SMOKE COMING OUT FROM VEHICLES CONTAINS CO ,WHICH IS VERY HARMFUL TO US.IT CAN DISPLACE OXYGEN AND CLING ON TO HEMOGLOBIN   AND CAN DECREASE THE AMOUNT OF OXYGEN IN THE BODY. SMOKE CAN ALSO CAUSE BLOOD CANCER.
IT ALSO CAUSES GLOBAL WARMING.
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sorry i mean capital letters