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which of the following are two mechanisms for water pollution?

a.

high and low

b.

direct and indirect

c.

lethal and nonlethal

d.

harmful and innocuous

Correct answer;
B
Direct and indirect

Direct is where pollutant are put in water bodies directly.
Indirectly is such as those involving the other substance such as air pollution or air pollution but at the end the pollutants contaminate the water bodies.