Diaphragm...is the muscle that helps in respiration.....there are also some other but....you said flat so diaphragm !
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It's C. Plants produce oxygen and nutrients via a process known as photosynthesis using water and carbon dioxide
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Organic waste in landfills generates, methane, a potent greenhouse gas. By composting wasted food and other organics, methane emissions are significantly reduced. Compost reduces and in some cases eliminates the need for chemical fertilizers. Compost promotes higher yields of agricultural crops.
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