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Lichen is a survival pact between fungus and algae

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Next time you feel co-dependent, remember that lichen is literally a hostage situation. It is a biological mashup of a fungus and an algae living together. The fungus builds the structural house and absorbs minerals, while the algae is trapped inside doing all the hard work of photosynthesis to pay the rent. They cannot survive alone.

Lichen is a survival pact between fungus and algae
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