User:CHOUDHARYTUSHAR/sandbox

● Co2 is necessary for humans as it is important for internal respiration ( inhale of oxygen and exhale of CO2 ).

● CO2 is also necessary for biochemical processes.

● Plants take in Co2 and give out oxygen which is used by humans.

The Co2 helps the plants to do photosynthesis and prepare food which in turn is eaten by animals and humans.

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