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A lichen is actually composed of two organisms: a fungi and a blue-green algae. Both organisms benefit from this relationship. What would we call this relationship?

User Mauris
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A symbiotic relationship. When both organisms benefit it is called a mutualistic relationship.
User Joe Erickson
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symbiosis - mutualism as both benefit from this relationship. Fungi gets food from algae, algae gets protection from fungi. 
User Waki
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