Answer :

The appropriate response is carbon dioxide. It is a dreary gas with a thickness around 60% higher than that of air that is unscented at regularly experienced fixations. Carbon dioxide comprises of a carbon molecule covalently twofold attached to two oxygen iotas.
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During photosynthesis, the carbon dioxide is taken b the plants and oxygen is released, and thus, emironmental balance of carbon dioxie and oxygen is maitained. Photosynthesis therefore, leads to decrease in carbon dioxide, and helps in preventing global warming caused by increased levels of carbon dioxide.