Biology 2010 Student Edition

Published by Prentice Hall
ISBN 10: 9780133669510
ISBN 13: 978-0-13366-951-0

Chapter 4, Ecosystems and Communities - 4.2 - Niches and Community Interactions - 4.2 Assessment - Page 104: 3a

Answer

A keystone species is one in which a change in its population causes great changes for the rest of the community.

Work Step by Step

The health of an ecosystem is greatly affected by the health of a keystone species. Changes in population numbers of a keystone species causes an ecosystem to lose its stability.
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