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A mushroom is the fleshy, spore-bearing fruiting body of a fungus, typically found growing above ground. Mushrooms typically have a cap and a stem (although some species are stemless), with gills or pores on the underside of the cap where spores are produced. Mushrooms play a crucial role in ecosystems by breaking down organic matter, helping plants absorb nutrients, and serving as a food source for various organisms. Mushrooms have been consumed by humans for millennia and are now cultivated commercially. They offer health benefits, including being low in calories, cholesterol, and sodium, and providing vitamins and minerals.