Most of them are multicellular organisms, except for a few which are single cells called yeast. In the early days of studies of living organisms, fungi were more closely related to plants, due to similarities in their lifestyle. But with the development of mycology, which is the branch that studies fungi, it was discovered that fungi, although thought to have similar characteristics to animals and plants, were themselves a unique kingdom. One of the most common misunderstandings about mushrooms is that it is common to think that as plants they use the process of photosynthesis to make their food, but this is not the case. Instead, they used a method more similar to the digestive process of animals, using enzymes that break down nutrients into smaller pieces that they can then absorb. Fungi can cause a number of plant and animal diseases: in humans, ringworm, athlete's foot and several more serious diseases are caused by fungi. Because fungi are more chemically and genetically similar to animals than to other organisms, fungal diseases are very difficult to treat. Many studies and research aim to determine how to prevent and control the impact of fungi on human society. Mushrooms are extremely important to the planet we live on. They provide fundamental products, including foods, medicines and enzymes, important for