Two Barnacles, Balanus and Chthamalus, Can Both Survive on the Lower

question 22

Multiple Choice

Two barnacles, Balanus and Chthamalus, can both survive on the lower rocks just above the low-tide line on the Scottish coast, but only Balanus actually does so, with Chthamalus adopting a higher zone. Which of the following best accounts for this niche separation?

• A)competitive exclusion
• B)predation of Chthamalus by Balanus
• C)cooperative displacement
• D)primary succession
• E)mutualism

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