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On Scottish coasts the larger barnacle Balanus excludes the smaller:

APisaster star
BOphrys orchid
CCactus moth
DChathamalus
Answer & Solution
Correct answer: D. Chathamalus
1. Connell studied barnacles on rocky shores. 2. The bigger species dominated the intertidal zone. 3. It excluded the smaller Chathamalus. _Source: syllabus Biology, Chapter 13, Organisms and Populations._
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