A substance that enters Earth's cycles and does harm to living things is a. a pollutant. b. hydrogen. c. freshwater. d. oxygen.

asked Jan 26, 2016 219k views

1 vote

A substance that enters Earth's cycles and does harm to living things is

a. a pollutant.
b. hydrogen.
c. freshwater.
d. oxygen.

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3 votes

............a pollutant...

Josh Zwiebel answered Jan 28, 2016

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6 votes

A pollutant because hyrdogen, freshwater and oxygen are all substances in which don't harm the earth's cycles