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Toxicology

A toxicologist studies the adverse effects of chemical agents on biological systems.

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Pharmacy

A pharmacist works with drugs in their preparation and use to cure, control, and prevent illness.

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Hydrology

The job of the hydrologist is to solve problems of water quality, quantity, and availability.

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Geology

A geologist is a scientist that studies the earth—its origin, history, and structure.

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Ecology

An ecologist studies the interactions between organisms and their past, present, and future environments.