A lichen is a fungus and an alga living together.The alga provides food for the fungus through photosynthesis.The fungus acts like a sponge, providing water for both organisms.Both species get their limiting resources from each other and cannot survive without each other.This is an example of

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This is an example of obligate mutualism because both species are dependent on each other for survival and cannot survive without each other.

A Lichen Is a Fungus and an Alga Living Together