A scientist is studying the effect of nitrates, a group of chemicals, on the aquatic environment and the organisms that live within it, such as aquatic snails and fish. This scientist is a(n) . A)
entomologist
B)
chemist
C)
hydrologist
D)
oceanographer
E)
toxicologist

A scientist who studies water and its properties is a hydrologist.

Explanation:

A hydrologist is a scientist linked to the study of water, both surface and underground, detecting cleanliness or contamination and proposing alternatives for its cleaning and conservation.

A hydrologist's research on the properties of water, its location, distribution and circulation contributes to the maintenance of the environment.

The other options are not correct because:

    A)  Entomologist : a scientist who studies insects.

    B)  Chemist : a professional who studies the elements and chemical compounds and their properties.

    D)  Oceanographer : study both oceans and seas, and their relationship with the environment, the atmosphere and the land.

    E)  Toxicologist: study the effects of toxic or harmful substances on living beings and the environment.

i wish i could with all of them i can barley see the first one so here's the answer to the first one b