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A lichen grows on the surface of a tree’s bark. Growing on the tree gives it access to sunlight and space to spread out, by raising it off the ground and away from plants that would otherwise grow over and through it. It does not use any resources from the tree or negatively affect the bark, and the presence or absence of the lichen does not benefit the tree in any way.

What kind of relationship is this?

A

Mutualism.

B

Amensalism.

C

Commensalism.

D

Parasitism.

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