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By Growing on the Trunk or Branch of a Tree,a

Question 23

Multiple Choice

By growing on the trunk or branch of a tree,a lichen gains height and exposure to sunlight for photosynthesis.The tree is not harmed by the lichen but does not benefit either.The relationship between the lichen and the tree is


A) commensalism.
B) mutualism.
C) parasitism.
D) interference competition.

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