The group
fungi includes mushrooms, molds and yeasts. Mushrooms are exclusively multicellular, whereas yeasts are exclusively unicellular.
Fungi live in moist environments, usually acting as decomposers of waste materials. However, some
fungi will grow in any suitable environment, which can include the surface or moist areas of a human body. Many human diseases are caused by
pathogenic or
opportunistic fungi.
Examples:
Candida yeasts cause yeast
infections (vaginal and oral are the most common);
Microsporum fungi cause athlete's foot and ringworm
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1 - Anatomy and Physiology Basics