Biology 2010 Student Edition

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

Chapter 4, Ecosystems and Communities - Assessment - 4.2 Niches and Community Interactions - Understand Key Concepts/Think Critically - Page 124: 7



Work Step by Step

Option a. is incorrect. In parasitism, one organism is harmed while the other benefits. Option b. is incorrect. In mutualism, both organisms benefit from the relationship. Option c. is incorrect. In competition, organisms fight for limited resources. Option d. is correct. Commensalism describes the relationship between two organisms in which one benefits and there is no effect on the other.
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