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What is considered as lungs of nature?

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in Energy Management by (679k points)
What is considered as lungs of nature?

(a) Rock

(b) Sun

(c) Water

(d) Trees

This question was posed to me during an interview.

My doubt is from Forest Ecosystems topic in chapter Ecosystems of Energy Management

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Right choice is (d) Trees

The best I can explain: Tress is considered as lungs of nature. Trees control pollutions by absorption and carbon dioxide and they release oxygen in return. This is similar to the respiration mechanism of lungs in humans where it takes oxygen by eliminating carbon dioxide.

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