Answer
D
Work Step by Step
In this hypothetical, the effect flows down from the top (the bison) to the bottom (the plants on which the bison feeds).
Campbell Biology (11th Edition)
by Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
Published by
Pearson
ISBN 10:
0-13409-341-0
ISBN 13:
978-0-13409-341-3
Chapter 54 - Test Your Understanding - Level 2 - Application/Analysis - Page 1235: 7
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