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- Carbon .
Question 1:
Carbon ....... is a natural gas found in our atmosphere. Humans breathe in oxygen and breath out this gas that*^*plants, in turn, absorb and use to stay alive. However, levels of this gas have increased in recent years*^*because it is released when we burn coal, gasoline and oil. It is now considered a greenhouse gas. A. monoxide
B. tax
C. dioxide
D. _
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