how does sponges live?
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Sponges (from Latin porus "pore" and ferre "to bear") are animals of the phylum Porifera. They are primitive, sessile, mostly marine, waterdwelling filter feeders that pump water through their matrix to filter out particulates of food matter. Sponges are among the simplest of animals. With no true tissues (parazoa), they lack muscles, nerves, and internal organs. Their similarity to colonial choanoflagellates shows the probable evolutionary jump from unicellular to multicellular organisms. There are over 5,000 modern species of sponges known, and they can be found attached to surfaces anywhere from the intertidal zone to as deep as 8,500 m (29,000 feet) or further. Though the fossil record of sponges dates back to the Precambrian era, new species are still commonly discovered.\n\nThe structure of a sponge is simple: it is shaped like a tube, with one end stuck to a rock or other object and an open end, the osculum, open to the environment. The spongocoel, or interior of the sponge, is composed of walls perforated with microscopic pores that allow water to flow through the spongocoel.
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If you removed all the sponges, you would remove some of the mass in the ocean displacing water. So in fact, the ocean would not be deeper, but shallower. \n\nI will leave it to the reader to estimate the reduced depth after sponge removal.
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algal production is the major source of energy for the anemone,  but they also hunt for food.  They are capable of travelling accross the reef on their 'foot'. they appear to have indefinate lifespans.  http://www.reefs.org/library/article/r_toonen8.html \nhttp://www.reefs.org/library/talklog/r_talukdar_102697.html
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Cuttlefish don't have any air-holes on the inner surface of their tentacles.  Or anywhere else for that matter.\n\nCuttlefish are strictly marine, and don't really have much interaction with air at all.  They breathe water, live in water, breed in water and feed in water.\n\nPerhaps you are refering to the suction cups on the tentacles?  The inner surface of the tentacles has a number of suction cups used in grabbing prey or other items.  The number of suction cups varies depending on the species of cuttlefish, and their age/size, and probably individual variations as well.  \n\nSo the answer would be somewhere between some and lots.
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Nothing if the protozoans are marine. If they are fresh water protozoans they will loose their water inside their membranes and implode by osmotic pressure and the membrane will rupture. BAD DAY!!
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Crabs have gills, but they usually can't stay on land for too long because they must keep their gills moist in order to breathe. They also have plates around their gills that protect them from losing moisture.\n\nCrabs that live on land live in cool, moist places so that they can breathe. They also drink water from the ground, or dew or water vapor, and can store it in their bladder or blood.\n\nThey do not have lungs.
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They don't...their shells grow with them.  Only hermit crabs get brand new shells.  Everything else either molts or has a shell that grows with the body.
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A living cell (like a cell from the liver, lungs, brain, etc...) will die soon after it was removed from its original "place" (liver, lungs, brain, etc.) as it has no more nutrients-supply (by blood venes, for example!) except it is kept in an artificial environment, a culture medium, which is suited to it's very specific needs.\n\nA living cell that is an organism needs a special suited environment, too (a diatom won't survive in the desert...). But it is not depending on an EXTERNAL supply of nutrients, as it "searches" its nutrients on its own. Bacteria, for example, don't need blood venes to grow in order to make cell division, they just need an environment which supplies all the needed nutrients. That's why bacteria can grow nearly everywhere, while lung cells  would die short after you dispersed them on an old dank sponge.\n\nHope I helped you. Excuse my English, please, it's not my first language. Good luck for tomorrow! ;-)
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Fish have a what is known as a slime coat, or mucous layer all over thier body. This layer is continually rubbed off and worn off. It helps keep of bacteria and some parasites.\n\nSome fish with take a brief sabd bath or mud bath on the bottom substrate. While others enlist the aid of others. Many large marine fish will have a cleaner shrimp or cleaner wrasse pick off parasites.\n\nIn general fish do not get dirty, so there is no real reason for them to keep clean.\n\nThey have a slime coat for protection against cuts and scrapes and parasites, and that is all they need.
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E.\nBecause bacteria can obtain nutrition chemically, they can live in conditions that no-one thought possible, for example in volcanic vents at the bottom of the ocean.
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No it would be shallower. My approximation is that it would be 3 quadrillionths of an inch (3 x 10^-15 inches) shallower, with an (error of +/- 3 ) if all the sponges were removed.
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Porifera - if I recall..\n\nYep.. here is a snip: The sponges or poriferans (from Latin porus "pore" and ferre "to bear") are animals of the phylum Porifera\n\nAnd here is the link:
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*singing* Ooooooooh who lives in a pineapple under the sea, spongebob square pants.....\n\nOf course I love Sponge Bob!
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GO TO:\nhttp://aquarium.ucsd.edu/challenger/index.cfm
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Sponges are able to reproduce sexually or asexually. Most sponges are monoecious. Sperm are formed from choanocytes; and oocytes derive from choanocytes in some sponges, and archaeocytes in others. Sperm are released into open water. Some sponges have oviparous fertilization where sperm and eggs meet in open water. In other species sperm are taken into the bodies of other sponges and fertilized inside; this is known as viviparous fertilization. The free-swimming larvae, known as parenchymula, serve as one of the main forms of dispersal for this largely sessile phylum. Asexual reproduction of sponges is through budding, where a small piece of sponge falls off of the main sponge and grows into a new one. Many freshwater sponges form small structures known as gemmules, which function as overwintering devices. These are similar to a bacterium's endospore. Gemmules are made up of amoebocytes surrounded by a layer of spicules and can survive conditions that would kill adult sponges. When the environment becomes less hostile, the gemmule resumes growing.
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There are none. The sponge's main function is to filter feed through the ocean. Their cell structures are specifically designed to do just that. So, because they are on the lower rungs of evolutionary history, they have not evolved sufficiently to have a respiratory and circulatory system.
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Hollow-bodied animals are the second simplest invertabrates. Some examples are jellyfish, hydra, coral, and sea anemones. Hallow-bodied animals are invertabrates with one opening and a hollow center.Hollow-bodied animals are like sponges in some ways. Hollow-bodied animals live in water, and some of them look like plants.Some hydra, sea anemones, and most coral attach themselves to rocks or the ocean floor.Some, like jellyfish swim or float in the water. Hollow-bodied animals can regenerate or regrow missing body parts.Hollow-bodied animals are more complex than sponges because they have a mouth and tentacles that help get their food into their mouth. Tentacles also can protect from predetors because they sting. Coral unlike hydra and sea anemones lives in colonies or large groups. Coral may look like tree branches and can be used in many different ways like for decorating.