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Earth Science c/o Lichens

1.  a lichen is an example of
a.  symbiosis
b.  mutualism
c.  parasitism
2.  Lichens are found in areas
a.  undergoing primary succession
b.  undergoing secondary succession
c.  of climax communites

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OLUWASEUN O. | Tutor in Math, Pre-Medical/Medical courses and Fitness/Martial Arts,Tutor in Math, Pre-Medical/Medical cours...
2.Lichens are first to appear in an area during Primary Succession


I though Lichen was an example of sybiosis.  Would you explain why it is mutualism.  thanks
Because Lichen is made up of algae and fungus  the algae, is green and is able to photosynthesize,making food for itself and the fungus, whereas the fungus takes in water for the algae, and together they form the lichen.