Question

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

Answer 1

Answer:

A Oxygen

Explanation:

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

Answer 2

A plants produce oxygen and humans take it in