Answer
A
Work Step by Step
The presence of E. coil helps indicate water quality. Therefore, the answer is A.
Environmental Science for AP* (2nd Edition)
by Friedland, Andrew J.; Relyea, Rick
Published by
W. H. Freeman
ISBN 10:
1464108684
ISBN 13:
978-1-46410-868-6
Chapter 14 - Module 41 - Wastewater from Humans and Livestock - AP Review Questions - Page 490: 3
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