Answer
It is due to the outer world influence, which brought about changes. The factors can be people, circumstances, ideas, movements, etc.
Work Step by Step
See answer.
Biology 2010 Student Edition
by Miller, Kenneth R.; Levine, Joseph S.
Published by
Prentice Hall
ISBN 10:
9780133669510
ISBN 13:
978-0-13366-951-0
Chapter 4, Ecosystems and Communities - 4.3 - Succession - 4.3 Assessment - Page 109: 1b
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