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Molds are microscopic fungi that are a natural part of the environment and can be found in moist places like soil, plants, and decaying matter. They can be white, black, green, or gray in color and often form a fuzzy growth called a mycelium on the surface of organic matter. Molds play an important role in the environment by breaking down organic material, and some are even beneficial, such as those used to make cheese and antibiotics. However, some molds can cause food to spoil.