Answer: B. Water
-During photosynthesis, plants take in carbon dioxide (CO2) and water (H2O) from the air and soil.
-Evapotranspiration also includes transpiration, which is the water movement from the soil to the atmosphere via plants.
-Evaporation is the process that changes liquid water to gaseous water (water vapor).
-Condensation is the process by which water vapor in the air is changed into liquid water.
- In order to take in oxygen and eliminate carbon dioxide, our lungs must be continually moistened with water.
-In humans, because usual fluid intake is above the requirement for sufficient hydration, the kidney excretes excess water.