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Question

Animals inhale gas A and exhale gas B. Gas A supports combustion. Gas B is used by plants to prepare their food. Identify gas A and gas B.

A
A: nitrogen, B: oxygen
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B
A: oxygen, B: carbon dioxide
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C
A: carbon dioxide, B: oxygen
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D
A: oxygen, B: nitrogen
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Solution

The correct option is B A: oxygen, B: carbon dioxide
During respiration, animals inhale oxygen and exhale carbon dioxide. Oxygen supports combustion. Hence gas A is oxygen.

Plants make their food by the process of photosynthesis. During this process, plants use carbon dioxide along with water to prepare their own food. Hence, gas B is carbon dioxide.

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