what is the function of the madreporite in a star fish (asteriodea)?
484135
it's a water filter to keep unwanted stuff from getting into the water vacular system
958855
Camouflage, regeneration and dual breeding.  A bizarre fact is a star fish has two ways to produce. One is through eggs and sperm, but  you can actually clone them if you cut them a certain way (using their regeneration property).  Fisherman realized this when they would catch them and try to kill them by cutting them up because they were felt they were a threat to what they wanted.  The more they cut them up, the more of these things they found.
196788
It is used as a fungicide and parasiticide in fish. If you define fungi as bacteria, it does inhibit bacterial growth. There are several parasites that affect fish and the compound is used to kill the parasites at low levels.
446332
Depends entirely on the species of star fish.\n\nThere are about 1800 different species of sea star (Echinoderms of the Class Asteroidea) and they occur in all of the world's oceans.  Some are adapted to live in warm, coastal seas and coral reefs, others prefer deep, dark cold environs.\n\nThere are even some that are found around the super-heated waters of the deep sea hydrothermal vents also known as 'black smokers'.
385963
Go to this site: http://en.wikipedia.org/wiki/Starfish\nYou should find all the necessary info on Starfish.
34470
ROACH, JELLY FISH, STAR FISH, CLAM, OYSTERS, FLYS, SPIDERS
305733
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.
975946
The shell will grow over time as the animal inside adds its building material to the leading edge near the opening. This causes the shell to become longer and wider to better accommodate the growing animal inside. A mollusc shell is formed, repaired and maintained by a part of the mollusc called the mantle. Injuries to or abnormal conditions of the mantle are often reflected in the shell they form and tend. When the animal encounters harsh conditions which limit its food supply or otherwise cause it to become dormant for a while, the mantle often ceases to produce the shell substance. When conditions improve again and the mantle resumes its task, a "growth line" which extends the entire length of the shell is produced, and the pattern and even the colors on the shell after these dormant periods are sometimes quite different from previous colors and patterns.\n\nThe majority of shells are made of nacre, an organic mixture of outer layers of horny conchiolin (a scleroprotein), followed by an intermediate layer of calcium carbonate (CaCO3) as either calcite or aragonite in the form of platy crystals. Shells of the class Polyplacophora are made of a softer calcium carbonate compound called chiton.  \nThe bright white sands found in tropical and subtropical coastal settings are ground-up limestone.  Arkose is a sand or sandstone with considerable feldspar content which is derived from the weathering and erosion of a (usually nearby) granite. Some locations have sands that contain magnetite, chlorite, glauconite or gypsum. Sands rich in magnetite are dark to black in color, as are sands derived from volcanic basalts. The chlorite-glauconite bearing sands are typically green in color, as are sands derived from basalts (lavas) with a high olivine content. The gypsum sand dunes of the White Sands National Monument in New Mexico are famous for their bright, white color. Sand deposits in some areas contain garnets and other resistant minerals, including some small gemstones.
80015
Yes; they need to, in order to maintain their internal ion/water balance (osmoregulation). Marine fish have to drink constantly to avoid dehydration; they have special cells in their gills to excrete the excess chloride.\nFreshwater fish face the opposite problem: their bodies tend to let water in and their internal ionic concentrations tend to become diluted. Therefore they drink water, retain the ions and afterwards excrete large volumes of very diluted urine. And they also have special cells in their gills for osmoregulation.
817926
It is a protrusion from a fungus, if I remember correctly. It is necessary for feeding saprophytically, that is secreting digestive enzymes into food then absorbing the digested food.
365759
Sponges are Porifera; hydra are Cniderians.\n\nPorifera have body pores (ostia), canals and chambers that serve for passage of water. They also have choanocytes (collar cells) specialized cells that create water currents, as they are filter feeders.  \n\nCnidarians have stinging cells organelles called nematocytes or cnidocytes. They also have a nerve net with symmettrical and asymmetrical synapses.  They have a muscular system.
5153
It's actually the Loop of Henle. It's a long, U-shaped portion of the tubule that conducts urine within each nephron in the kidneys of reptiles, birds and mammals. It's principal function is the recovery of water and sodium chloride from the urine.
258574
a jellyfish is an invertebrete.\na cuttlefish is not a fish!! it is a cnidarian, henceforth an invertebrate\n\nan eel is a vertebrate
735550
the paramecium gets rid of excess water through the contractile vacuole.  this regulates the amount of water in the body of the paramecium. \n\nSince the regulation of the amounts of water and minerals in the body is included under the term homeostasis, the contractile vacuole is said to help maintain homeostasis.
378096
(www.google.com)\n(www.wikipedia.com)\n\nHere the site in sources, I looked starfishes up in google and this is one of the search sites it came up with.\n\nPut this info below in your own words because this info is from copywright google:\n\nThe Class Asteroidea ("star form") includes animals commonly called starfish or sea stars.  Most forms have a flattened and flexible body with a varying number (often five) arms, or rays, arranged around a central disc. The oral surface (the side with the mouth) faces the substrate.  The "top side" (aboral surface) contains the anus and the entrance to the water-vascular systems called a madreporite.  Water enters the madreporite and is delivered through a system of canals to the tube feet, which are equipped with suckers that can adhere to the substrate or their prey (often bivalves).  Although beautiful, some starfish are regarded as serious pests to the oyster, clam and mussel industry, and the crown-of-thorns starfish (Acanthaster planci) can severely damage Pacific coral reefs by its grazing activities (i.e. feeding on the coral polyps). \n\n\nGood luck
284889
hey man i got this site search it for more info\n http://animaldiversity.ummz.umich.edu/site/accounts/information/Cygnus_buccinator.html
45390
Good Question:\n\nParamecium eat bacteria.