A tree uses gas A to produce gas B. An animal uses gas B to produce gas A. What is gas B in this
cycle?
A: oxygen
B: nitrogen
C: carbon dioxide
D: carbon monoxide
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A tree uses gas A to produce gas B. An animal uses gas B to produce gas A. What is gas B in this
cycle?
A: oxygen
B: nitrogen
C: carbon dioxide
D: carbon monoxide
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Answer:
o2
a is correct as tree takes co2 and gives o2