Which sentences describe the discipline of the natural sciences? It includes different sciences, such as biology, chemistry, and earth sciences. With the help of toxicology, environmental scientists can study the toxic effects of chemicals on humans. Chemistry contributes to environmental science through the study of chemicals and chemical processes, such as pollutants and the chemical characteristics of the environment. Earth science helps in studying Earth, the oceans, and the atmosphere. In addition, epidemiology, which is another prominent scientific field, guides environmental scientists to study diseases that affect human health.