It is best to say the efficient plumbing a. reduces water pollution by using less water. b. reduces water pollution by using cleaner water. c. increases water pollution by using more water d. reduces water pollution by using dirty water.

A: reduces water pollution by using less water

Explanation:

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).

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