Answer
D.
Work Step by Step
A.-C. have to do with trophic levels, while D., the correct answer, is something which transcends these levels and affects the whole ecosystem.
Biology (11th Edition)
by Raven, Peter; Johnson, George; Mason, Kenneth; Losos, Jonathan; Singer, Susan
Published by
McGraw-Hill Education
ISBN 10:
1259188132
ISBN 13:
978-1-25918-813-8
Chapter 56 - Community Ecology - Review Questions - Understand - Page 1208: 6
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