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10 July, 11:01

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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Answers (2)
  1. 10 July, 11:07
    0
    A plants produce oxygen and humans take it in
  2. 10 July, 11:12
    0
    A Oxygen

    Explanation:

    this is because plants use carbon dioxide to produce oxygen and humans/animals use oxygen to produce carbon dioxide.
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