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Fungi are more closely related to animals than they are to plants (despite physical appearances). Fungi and Animals both evolved from a choanoflagellate ancestor (a protist), while plants evolved from another eukaryotic protist lineage (the green algae lineage). Because we wanted to call them sponges. Sponges belong to the animal kingdom since they are heterotrophic. Fungi derive food from breaking doown orgainc material in soil. Sponges feed on existing material. This is the difference Sponges are similar to other animals in that they are multicellular, heterotrophic, lack cell walls and produce sperm cells. Unlike other animals, they lack true tissues and organs, and have no body symmetry. Many sponges have internal skeletons of spongin and/or spicules of calcium carbonate or silicon dioxide. All sponges are sessile aquatic animals. Although there are freshwater species, the great majority are marine (salt water) species, ranging from tidal zones to depths exceeding 8,800 m (5.5 mi). Best Answer: Because it belongs to the animal kingdom rather than the fungi or plant kingdoms. Sponges are heterotrophic-they feed on existing organic matter, unlike autotrophic plants that make it themselves. They filter feed rather that feed saprotrophically, which distinguishes them from fungi. EDIT: Look, I took the time to answer you question, at least read my answer properly. Sponges are extremely primitive invertebrate life so are classed under the Kingdom Animalia, they do not photosynthesise so are not plants. They are also very different to fungi and have an entirely different composition and life cycle. A sponge if passed through a sieve gradually reforms its original shape. Kitchen spone microbes. Kitchen sponges can accumulate food and microbes when used for long periods of time and are not thoroughly cleaned. The moisture and food particles in a dirty sponge make it a perfect environment for microorganisms to grow (such as, bacteria and fungi). Their waste products give the sponge a distinctive smell. Fungi are a group of living organisms, consisting from unicellular yeasts, and multicellular molds and mushrooms. A word fungus, plural fungi, is adopted from Latin fungus (mushroom), from Greek sphongos (sponge), and refers to a physical appearance of fungi. Like a sponge, they will resume their original shape if water is squeezed out. The spores, produced on the surfaces of the hollows of the sponge, are almond-shaped with rough surfaces, and measure 10–12.5 by 6–7 micrometers. The name of the fungus is derived from the cartoon character SpongeBob SquarePants.  Sponges are animals of the phylum Porifera (/pɒˈrɪfərə/ ; meaning pore bearer). They are multicellular organisms that have bodies full of pores and channels allowing water to circulate through them, consisting of jelly-like mesohyl sandwiched between two thin layers of cells. Many sponges have internal skeletons of spongin and/or spicules of calcium carbonate or silicon dioxide. All sponges are sessile aquatic animals. Although there are freshwater species, the great majority are marine (salt water) species, ranging from tidal zones to depths exceeding 8,800 m (5.5 mi). Differences Between Fungi and Animals. Some fungi are single-celled organisms, such as the yeasts. All metazoans, on the other hand, have multiple cells. Even the simplest animal, the sponge, consists of many cells specialized for different tasks. All animals are motile, that is, able to move independently, at least at some stage of development. Even sessile, immobile animals such as sponges and corals have motile larvae. Fungi, on the other hand, are not able to move independently. Many types of tissue are unique to animals, such as muscles and nerve
http://www.answers.com/Q/Why_are_sponges_not_considered_a_fungi https://en.wikipedia.org/wiki/Sponge https://uk.answers.yahoo.com/question/index?qid=20080910150720AAs2BsN http://denniskunkel.com/DK/Miscellaneous/92340B.html http://www.healthhype.com/kingdom-fungi-types-characteristics-examples-pictures-of-fungi.html https://en.wikipedia.org/wiki/Spongiforma_squarepantsii https://en.wikipedia.org/wiki/Sponge http://www.brighthubeducation.com/science-homework-help/8061-relationship-between-animal-plant-and-fungi-phylogeny/
are sponges fungi