A  fungus  is  any  membre  of  the  group  of  eukaryoyic  organisms.That  includes  microorganisms  such  as yeasts  and  molds, as  well  as  the  more familiar mushroom.These organisms are classified as kingdom,fungi,which  is seprate from the other eukaryotic  life kingdoms of plants and animals.A characteristic that places fungi in a different kingdom from plants,bacteria and some protists is chitin in their cell walls.Similar to animals,fungi are heterotrops ,they acquire their food by absorbing dissolved molecules.