Answer
E
Work Step by Step
Secondary treatment is the most effective in eliminating pathogens. This is because 90 percent of organic matter is eliminated in this stage. Therefore, the answer is E.
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 - AP Environmental Science Practice Exam - Section 1: Multiple-Choice Questions - Page 514: 4
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