Mold is not a plant and not an animal. Mold is a fungi with its own unique life-style, starting from a tiny microorganism called spore. Not all fungi are as unwanted as mold. Some are great decomposers, where decomposition is wanted. Antibiotics such as Penicillin are fungi, their development is a blessing for people. Even in our food we welcome the distinctive taste of yeast-fungi when brewing or baking.