Answer: Atmosphere
Step-by-step explanation:
The carbon dioxide is a colorless gas. It is composed of one carbon atom and two oxygen atoms. It is present naturally in the earth atmosphere but the concentration of carbon dioxide can increase by the human activities like burning of fossil fuels, and deforestation. The hydrosphere is one of the sphere of the earth which includes the water bodies. The carbon dioxide being a gas present in the atmosphere can diffuse inside a water body (ocean, river, lakes) which is the part of hydrosphere.