Which is the best description of the mutual benefit to both species found in a lichen?

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In a lichen, the mutual benefit is that the autotrophic component (often algae or cyanobacteria) photosynthesizes, producing energy (in the form of carbohydrates) that feeds both organisms. The heterotrophic component (usually a fungus) provides structure, protection, and helps retain water, which benefits both organisms by preventing dehydration.

Which Is the Best Description of the Mutual Benefit to Both