Lichen is made up of fungus and algae and can also transform carbon dioxide into oxygen through photosynthesis. It can be found on some trees that do not get that much sunlight. The lichen does not benefit nor harm the tree at all. It is actually just using the tree as a place to live and grow. The fungus helps keep moisture in and stick the lichen to the tree, while the algae helps both thrive through the process of photosynthesis.
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