Biology 2010 Student Edition

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

Chapter 4, Ecosystems and Communities - Standardized Test Prep - Page 127: 4



Work Step by Step

Option B is incorrect. Predation happens when one organism consumes another. Option C is incorrect. Commensalism is a relationship between two organisms in which one benefits and the other is neither harmed nor receives any benefit from the relationship. Option D is incorrect. In mutualism, both organisms benefit from their relationship. Option A is correct. In competitive exclusion, if one organism is better suited for a specific niche than another species, then the species less suited will die out.
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