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A lichen is composed of two organisms—a fungus and an alga—that depend upon each other for survival. Which term BEST describes their relationship? A. parasitism B. mutualism C. symbiosis D. commensalism
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A lichen is composed of two organisms—a fungus and an alga—that depend upon each other for survival. Which term BEST describes their relationship?

A. parasitism
B. mutualism
C. symbiosis
D. commensalism

User Vanlooverenkoen
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B. Is correct because in mutualism both species benefit. It could be symbiosis but mutualism is more specific.
User Sdornan
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