The scientist can be said to be studying Aquaology. Aquaology is the study of water, including its properties, quality, and the organisms within it. The other terms listed do not specifically refer to the study of water in the context presented. Hydrology is more focused on the movement and distribution of water in the environment, while hydrogen refers to a chemical element, and a hydrometer is an instrument used to measure the specific gravity of liquids.
A scientist is studying water samples from a pond. They check the pH, the oxygen levels, and the amount of bacteria in the water. They can be said to be studying
Hydrology
Hydrogen
Hydrometer
Aquaology
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