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Plants need CO2 for their process of photosynthesis. As animals exhale co2, this is taken up by the plants..
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Plants and animals are interdependent. Plants require nutrients and carbon dioxide alongwith sunlight and water for growth. Since animal faeces are nitrogenous waste they act as natural fertilizers for plants. While the CO2 exhaled by animals are used by plants in the the process of photosynthesis.

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