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What is Mold?

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A mold is a type of fungus: a plant-like organism that does not use photosynthesis to produce food, but instead obtains it directly from its surroundings. Molds can display themselves in a variety of colors, such as the familiar green covering often seen on bread or fruit, but this is due only to the reproductive part of the organism — the fungal equivalent of flowers and fruit. The main part of the fungus consists of a network of thin, transparent filaments known as  hyphae , which is much less visible. These fungi can grow on a variety of materials, including soil, decaying plant parts, food, fabrics, and damp walls. They reproduce by releasing huge numbers of tinyspores, which are very tough, and can withstand drying and freezing. Although mold can be a nuisance, and occasionally a health hazard, they can also be useful; they are essential for the breakdown of dead organic matter in the natural environment, they are a valuable source of antibiotics...