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An interaction in which one species is harmed and the other unaffected is:

ACommensalism
BMutualism
CParasitism
DAmensalism
Answer & Solution
Correct answer: D. Amensalism
1. Commensalism benefits one and leaves the other unaffected. 2. Harm to one with no effect on the other is amensalism. 3. Both lose in competition. _Source: syllabus Biology, Chapter 13, Organisms and Populations._
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