What is ecotoxicology and how does it inform decisions that have human health relevance?

• A. Ecotoxicology studies effects of chemicals on ecosystems; it informs human health risk indirectly through environmental exposure pathways and ecosystem services.
• B. Ecotoxicology studies only test chemicals planned for use in human medicine.
• C. Ecotoxicology measures the direct dose–response in human tissues.
• D. Ecotoxicology is the same as toxicology in mammals.

Answer: (A)

Ecotoxicology studies how chemicals affect living organisms in the environment and how these effects influence ecosystem function. It informs decisions with human health relevance by tracing how a chemical moves through air, water, soil, and food chains, how organisms accumulate it, and what adverse effects occur across species and at different environmental levels. This information helps assess real-world exposure scenarios for people—through drinking water, food, or air—and shows how ecological disruptions can indirectly impact health, such as by reducing water quality, altering pests and pollinators, or changing food webs that people rely on. In short, ecotoxicology links environmental effects to human health risk through environmental exposure pathways and the value of ecosystem services.

The other ideas are narrower or incorrect: it isn’t limited to medicines, it isn’t just about direct dose–response in human tissues, and it isn’t simply the same field as mammalian toxicology.