Fungi can be single-celled or multicellular organisms. They are present in almost any habitat, but most live on the ground, instead of in the sea or freshwater, mostly in soil or plant material. In soil or on decaying plants, a community called the decomposers develops where they play a significant role in the recycling of carbon and other elements. Some are disease-causing plant pest... https://www.cd-genomics.com/microbioseq/more-to-know-about-fungi-definition-structure-life-cycle-and-reproduction.html