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  4. Amazon rainforests are considered as 'lungs of the planet' as they contribute of the total oxygen in the earth's atmosphere.

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Q. Amazon rainforests are considered as 'lungs of the planet' as they contribute___ of the total oxygen in the earth's atmosphere.

Biodiversity and Conservation

Solution:

About $20\%$ of the world oxygen is produced in the amazon rainforests. They are described as the 'lungs of the planet' because they provide the essential world environmental service of continuously recycling $CO_2$ into $O_2$.