asalstoryenny asalstoryenny

12-11-2015
Biology

contestada

A substance that enters Earth's cycles and does harm to living things is
A. hydrogen.
B. a pollutant.
C. freshwater.
D. oxygen.

Respuesta :

Kalahira Kalahira

23-08-2017

Pollutants are substances that do harm to an environment and the beings that live in it. Fresh water and oxygen are beneficial and necessary for life. Hydrogen is a naturally occuring element and isn't harmful. The EPA is a government department that works to prevent pollution.

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