Forest is a rich source of:

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Nitrogen

Oxygen

Carbon dioxide

All of the above

answer is B.

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Detailed Solution

Concept: A forest is a large ground with trees growing on it. The plants and microbes on this planet maintain the balance of oxygen, and the Amazon forest contributes around 20% of the oxygen we breathe daily.
In a process known as photosynthesis, they change CO2 into oxygen (O2) using the energy from the sun, water, and minerals. Therefore, the rainforest is considered the lungs of our earth. In addition to photosynthesis, forests contain microorganisms (blue-green algae) that contribute significantly to the large-scale production of oxygen. By absorbing carbon dioxide and releasing oxygen into the air, plants balance the oxygen they create.
Hence, option 2 is the correct answer.

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