How many air-holes are on the inner surface on the tentacles of a cuttlefish ?
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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.
285648
I think the phylum name means "nettle" - it comes from the latin cnida\nthe central cavity is the spongocoel\nAnd i believe that ctenophora have colloblasts on the tenticles which burst when they come into contact with prey, releasing sticky fibres. Some just have mucus covered tenticles. Cnidaria on the other hand are your jellyfishes sometimes with masses of tenticles, and uses stinger cells.\n\nI hope this helps - i will admit marine biology is not my speciality, but I have done a bit.
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The only one I can think of is the shellfish called mussels.\n\nThese links should help you figure it out.
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Fishes have eyeballs, two of them in their optic capsules, just like all other vertebrates. They're surrounded partly by bone, and partly by an elastic but resistant capsule. \nBony fishes don't have eyelids, but sharks and rays do\n(see answer at \nhttp://answers.yahoo.com/question/index;_ylt=AqPoH8mhQReCU_CYDM1Fvirsy6IX?qid=1006030500996 )\n\nAnd they _do_ have nostrils, but, as you have rightly deducted, they're not used for breathing. \nIf you look at a bony fish (a goldfish or whatever you have at hand) you'll see that it has TWO nostrils on each side of its snout (they can be close together or really distant). Between these two nostrils of each side there is a tube with special olfactory (smelling) cells, like the ones we have in our own noses. The water with chemical "smell/flavor" molecules goes in through the anterior opening, and flows out through the posterior opening. Thus, fish nostrils (derived from the primitive pair of olfactory capsules) are used for smell/flavor perception, and not for breathing (which occurs at the gills). \nIt's only in tetrapods (from amphibians to reptiles, birds and mammals) that the connection between the nostrils and the respiratory system occurs (and the lungs appear). If you open a frog's mouth (please only try it with a dead animal!) you'll see two paired holes in the roof of its mouth. Those are the internal nostrils (called "choanae") and they allow passage of breathing air to the mouth--> pharynx--> lungs. \n\nAdditional trivia:\n- Our own internal nostrils open way back in our pharynx, because we have a secondary palate.\n- Cartilaginous fishes have only one nostril on each side of the snout. However, each nostril is partly separated into 2 parts by a flap of skin, and actually water flows through the nostril just as in bony fishes.\n- Some bony fishes, the cichlids (discus, Jack Dempsey), have only one nostril on each side of the snout.
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Aplysina lacunosa= 3 to 5 feet long, some considerably larger. Large clusters with  10 or more tubes can be more than 6 feet across. Outer surface covered with wart-like bumps.  They are typically found from depths of 40-80 feet deep, protruding from the coral wall face. The Tube Sponge is one of the most common varieties of sponge to be found on the reef. It is distinguished by its long tube-shaped growths, and ranges in color from purple to blue, gray, and gray-green. Filtered water is ejected through the large openings on the ends. This is one of the few reef invertebrates that is blue in color..
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It may be that the stress of producing young is enough to do her in; cuttlefish are not exactly the most hardy critters.  Typically, most species only live about year or so, anyway, so they only go through a single breeding season before dying.\n\nAccording to the amateur breeder/enthusiast listed below, females can lay several clutches of eggs, and can live for months after egg laying.
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I have zero knowledge of the full contents of the earth's oceans, but i'm going to throw out my opinion here that while almost anything is possible, it is improbable that mermaids truly exist in the form we see them in fairy tales.  They are represented as human formed/fish tailed beings, with human upper bodies, lungs, arms, etc...meaning they would be breathing air, not processing oxygen from water.  In spite of the size of the oceans, mermaids leaping from the water to suck in some air would eventually be spotted, certainly at a frequency greater than once every 500 years.
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Information\n...c. octopus - carnivore 13. Circulatory system 14. Respiratory system ... 1. Phylum: Coelenterata 2. Examples: jellyfish, sea anemone, hydra 3\nhttp://www.scsc.k12.ar.us/1999bst/Members/ArnoldL/supporting_information.htm \n\n \nPorifera\n...digestive cavity. systems ... excretory ... circulatory ... respiratory ... digestive ... Portuguese man-of-war. Sea anemone Diagram\nhttp://homepage.smc.edu/hodson_kent/Animal/ANIMKG.HTM \n\n \nCirculation through Excretion Notes\nThe Circulatory System: What is the ... Simple animals such as the sea anemone, the flatworm planarian, and ... line our digestive, respiratory,...\nhttp://online.morainevalley.edu/WebSupported/BIO112/circulation,_immune,_digestion,_respiration,_and_excretion_notes.htm \n\n \nCh22_Animal Classification\nRadiata Phylum Cnidaria - e.g. hydra, jellyfish, sea anemone, coral. Have ... longitiudinal nerve cord ... lack respiratory and circulatory system\nhttp://ccollege.hccs.edu/instru/Biology/Turell/Ch22_animalclassif.htm \n\n \njellyfish\n...system, excretory system, respiratory system, or circulatory system. ... The polyp resembles a tiny sea anemone -- cup-shaped with tentacles\nhttp://blather.newdream.net/j/jellyfish.html \n\n \nChapter 41: Circulation\n...a circulatory system is unnecessary. 2. Sea anemone cells are part of external layer or gastrovascular ... lacks hemoglobin or other\nhttp://www.sirinet.net/~jgjohnso/apbio41.html \n\n \nCoelenterates and Ctenophores (from invertebrate) --  Britannica...\n...circulatory, respiratory, and excretory organs. They have nerve cells but no organized nervous system. (See also Coral; Jellyfish; Sea...
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Mollusks generally have:\n\n  - a muscular foot (or tentacle)\n  - a mantle\n  - a shell\n  - a body (digestive, excretory, reproductive organs)\n \nThey also often have:\n\n  - a gill\n  - a radula
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Here is an anatomical chart for a sea urchin:\nhttp://www.carolina.com/life_science/pdfs/sea_urchin_anatomy_guide.pdf\n\nThere is an interactive dissection guide here:\nhttp://www.carolina.com/life_science/sea_urchin.asp\n\nFrom looking at these photos there appear to be two gonads, but I am not a biologist. Most of the echinoderms I work with are fossilized- except for the ones I have eaten.
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when you cut the planaria there will be two planaria. the half parts will complete themselves
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http://www.ucmp.berkeley.edu/platyhelminthes/platyhelminthes.html
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1 stoma (can close on its own, most of them located on leaves), \n2 lenticela (cant close on its own - the tiny dots we can best observe on some woody stalks)\n\npersonally i would also count all the extracellular space inside plants - the quite elaborate system of interconnected cavities that takes the air through the inside of a plant to everyplace where necessary
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Sorry, I hate correcting people, but cnidarians aren't sponges.\n\nSponges are of the phylum porifera.\nCnidarians are things like coral and jellyfish.\n\nSponges have lots of holes.\n\nThey have loads of ostia, which are the small holes all around it, where water goes in to the sponge.\nDepending on the species, they may have 1 to 100s of osculums, which are the larger holes at the top where the water comes out.
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Is this a trick question? Like how much wood could a woodchuck chuck?\n\nPlural of octopus is octopi.\n\n200,000 eggs
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Ears - 2\nNostrils - 2\nMouth - 1\nNavel - 1\nVagina - 3  Penis - 1\nAnus - 1\n\nSo, if you're male = 8.\nFemale = 10.
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Large, but Short-Lived Mollusk\nThe largest of at least 90 subspecies of octopus, the giant octopus can grow to 300 pounds and have a 30-foot arm span. However, mature males average only about 50 pounds and females, about 33 pounds. Their arm spans typically are about eight feet. Despite its fearsome appearance, the giant octopus—while quite resourceful—is very shy and poses little danger to divers, fishermen, or swimmers. These mollusks are distant relatives of garden snails and slugs, and closer relatives of squids and cuttlefish. The giant octopus can be found in the coastal waters of northern California through the Gulf of Alaska, and around the Pacific Rim to Japan and Korea. They live in waters just beyond the low-tide mark to depths of up to 1,500 feet along the continental shelf. They usually live about three to five years.