Occupational and Environmental Health Practice Exam 2026 – Your Comprehensive All-In-One Guide to Mastering Disease and Injury Prevention!

Toxicology is the study of the harmful effects of chemicals on living organisms. This means that it focuses specifically on the effects of chemicals, such as drugs or pollutants, on plants, animals, and humans. It is not related to animal behavior (option A) or the movement of celestial bodies (option B). Additionally, although plant diseases (option D) may be caused by chemicals, toxicology deals with the effects of chemicals on living organisms rather than the diseases they cause. Therefore, the best answer is C the study of the harmful effects of chemicals on living organisms.