carbon cycle
Part of all living and some non-living. Co2 is everwhere, because of pollution. we burn fossil fuels everyday from cars, factory, planes, and trains.Carbon cycle start with a plant and a tractor. when a tractor till the land, the tractor is releasing co2 into the air. when the plant grow, the Plant make Photosynthesis (co2 + sunlight)known as oxygen. when a human breath in oxygen, and release co2 in the air.