The proportion of oxygen and carbon dioxide in the atmosphere is maintained by ___ .

plants

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animals

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machines

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both plants and animals

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Solution

The correct option is D
both plants and animals

During respiration, oxygen is taken in and carbon dioxide is released. During photosynthesis in plants, carbon dioxide is absorbed and oxygen is released. The proportion of oxygen and carbon dioxide in the atmosphere is maintained both by plants and animals.

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Question 19
Choose the correct sequences

(a) $C O_{2}$ in atmosphere → decomposers → organic carbon in animals → organic carbon in plants
(b) $C O_{2}$ in atmosphere → organic carbon in plants → organic carbon in animals → inorganic carbon in soil
(c) Inorganic carbonates in water → organic carbon in plants → organic carbon in animals → scavengers
(d) Organic carbon in animals → decomposers → $C O_{2}$ in atmosphere → organic carbon in plants

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