Environmental science is the study of toxins in the air the history of earth the living things that affect an organism everything that surrounds an organism

The answer is; everything that surrounds an organism

Environmental science is an inter-multidisciplinary field that incorporates ecology, physics, biology, chemistry, mineralogy, geology and etcetera in the endeavor to study the environment we live in. Further studies are beginning to incorporate spacetime in environmental science studies.

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the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.