How do bothsprcies benefit in a lichen benefit?

In a lichen, the two species involved—a fungus and a photosynthetic partner, usually an alga or cyanobacterium—benefit mutually through a symbiotic relationship. The fungus provides structure, protection, and moisture retention for the photosynthetic partner, while the alga or cyanobacterium produces organic compounds through photosynthesis, which serve as a food source for the fungus. This partnership allows both organisms to thrive in environments where they might struggle to survive alone. Overall, their cooperation enhances their resilience and nutrient acquisition.