Answer
b. population.
Work Step by Step
An ecologist is monitoring the number of gorillas in a wildlife refuge over a period of five years. He/she is studying ecology at the population level.
Campbell Biology: Concepts & Connections (9th Edition)
by Taylor, Martha R.; Simon, Eric J.; Dickey, Jean L.; Hogan, Kelly A.; Reece, Jane B.
Published by
Pearson
ISBN 10:
0-13429-601-X
ISBN 13:
978-0-13429-601-2
Chapter 34 - Review - Page 701: 14
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