What are the sources of carbon dioxide in the air?

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Respiration by plants and animals

Photosynthesis

Burning of fuel

Both 1 and 3

answer is D.

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Detailed Solution

Respiration by plants and animals and burning of fuel are sources of carbon dioxide.
Air is a mixture of gases. Carbon dioxide is also one of the gases present in the air. There are various sources of carbon dioxide in the air. Plants and animals respire. During the process of respiration, they take in oxygen and give out carbon dioxide gas. Some human activities like burning of coal or other fuel also produce carbon dioxide.

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