What is ecotoxicology primarily concerned with?

Ecotoxicology is a specialized field that focuses on understanding the toxic effects of chemicals and other harmful agents on living organisms and their environments. Its primary concern is how these toxic substances interact within ecosystems, assessing the impact on biodiversity, species interactions, and ecosystem health. The study spans across multiple disciplines, including chemistry, biology, and environmental science, to evaluate how pollutants affect flora and fauna, as well as the implications for human health and safety.

The other options do not capture the essence of ecotoxicology. While option A discusses natural substances and their health effects, it does not address the focus on anthropogenic (human-made) chemicals and environmental interactions. Option C relates more to behavioral aspects concerning chemical safety rather than the specific study of toxic effects on ecosystems. Lastly, option D pertains to regulatory frameworks rather than the fundamental scientific study of the effects of toxic substances. Thus, the answer highlighting ecotoxicology's focus on the toxic effects of chemicals on the environment and organisms is the most accurate representation of this field.