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Toxicology

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

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Mathematics

A mathematician uses numbers and symbols in many ways, from creating new theories to translating scientific and technical problems into mathematical terms.

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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.

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