Answer
C
Work Step by Step
If oxygen percentages in a certain area are very low, then we classify these as dead zones.
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: 2
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