The assertion that some organisms live together and share both shelter and nutrients is correct. Lichens are a prime example of such organisms.
Lichens are a unique symbiotic relationship between a fungus and an alga or cyanobacterium.
The fungus provides the shelter and protection by forming a structure or thallus, which acts as a home for the alga or cyanobacterium. In return, the alga or cyanobacterium provides nutrients through photosynthesis.
This mutualistic relationship allows both organisms to benefit. The fungus benefits from the nutrients produced by the photosynthetic partner, which helps it thrive in nutrient-poor environments.
Therefore, the organisms that live together in this symbiotic relationship are indeed called lichens.
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