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Read the passage: Forests are called the 'lungs of the world'. They absorb carbon dioxide and release oxygen. Deforestation, however, is threatening this balance. Protecting forests is vital for our survival. Question: Why are forests compared to 'lungs'?

ABecause they are shaped like lungs

BBecause they absorb carbon dioxide and release oxygen

CBecause they are found everywhere

DBecause they provide wood for furniture