what are 4 parts of the body plan of most mollusk?
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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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ear, eye, lip, toe, jaw, gum, hip, rib, leg, arm
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They vary as widely as the body plans of different mollusks, but basically there are both macrophagous (herbivores and predators) and microphagous (suspension feeders) forms.\n \n**Gasteropods (snails and slugs) are mainly herbivorous; they use their radula to scratch plant tissues. However, there are also predatory snails (with modified radula, or proboscis, or even a venom-injecting radula). There are also microphagous planktonic forms (pteropods).\n**Cephalopods (squids, octopi and their relatives) are predatory carnivores, they have a modified radula and a horny "beak" with which they eat different invertebrates and vertebrates.\n**Bivalves (clams, mussels, oysters, etc) are primarily microphagous or suspension (filter) feeders. They don't have a radula and rely on their modified gills for filtration. There are also some primitive detritivores among the bivalvians.\n**The chitons (Polyplacophora) are grazing herbivores (with  radula).\n**The Scaphopoda (tusk shells) capture small food items (particulate matter) with their tentacles (captacula).\n**Other less known mollusks include the caudofoveatans (these capture foraminiferans and other very small organisms from sediments), solenogasters (these eat corals) and monoplacophorans (with a radula, but not much is known about their ecology).
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1. Nucleus\n2. Food Vacuole\n3. Contractile Vacuole\n4. Cytoplasm\n5. Psedopod\n6. Cell membrane
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Here is a list of all the parts of an animal cell:\n1.  Plasma Membrane\n2.  Nucleus\n3.  Rough Endoplasmic Reticulum\n4.  Smooth Endoplasmic Reticulum\n5.  Mitochondria\n6.  Ribosomes\n7.  Golgi Apparatus\n8.  Lysosome\n9.  Microtubules\n10. Microfilaments\n11. Intermediate filaments\n12. Microvilli\n13. Peroxisome\n14. Centrosome\n15. Flagellum\n16. Chromatin\n17. Nucleolus\n18. Nuclear Envelope
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These steps will separate most modern animal phyla.\n\nDeveloping:\nFrom a single cell to a multi-cellular body\nFrom radial to bilateral body symmetry\nFrom spiral to radial plane of cleavage in egg division\nFrom a blastopore that forms a mouth to a blastopore that forms the anus\nFrom an incomplete digestive track to complete\nFrom no coelom, to a pseudocoel, to a true coelom\nFrom a true coelom with 2 layers to one with 3 layers\nFrom a ventral nervous system to one that is dorsal\nComplicated organ systems: excretory, circulatory, respiratory\nFrom a non-segmented body to segmentation
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The Annelida have bilateral symmetry .The annelids also have a one-way digestive system . It has a segmented anterior with 8 hearts in each. It also has a body cavity. \n\nThe Mollusks are also bilateral like the annelids. They have a good nervous system. They also have a one-way digestive system. They have a coelom like the . The classes of mollusks are the bivalves, which have two valves, which the name suggests. It has 2 shells and 3 layers also. It has a mantle and it lives in the water. It has gills and abductor muscles. It has an excurrent and incurrent siphon, which no other phylum has. There are the gastropods, which live in land and ocean. It has one shell and one foot. There are also the cephalopods, which has tentacles a foot that can either be a sucker or hook.
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The uterus, ovaries, fallopian tubes, cervix, vulva, clitorius.
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1.  Neck\n2.  Armpits\n3.  Knees\n4.  Waist\n5.  Back\n6.  Feet\n7.  Breasts\n8.  Pubic area\n9.  Inside the pubic area\n10,  Ears
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Organs:\n1.  Brain\n2.  Voice Box\n3.  Lungs\n4.  Heart\n5.  Liver\n6.  Spleen\n7.  Stomach \n8.  Kidnets\n9.  Large Intestine\n10. Small Inestine\n11. Skin\n12. Bladder\n13. Gallbladder\n14. Pancreas\n15. Female/Male Genitals\n16. Appendix\n\nOrgan Systems:\n1.  Circulatory\n2.  Digestive\n3.  Endocrine\n4.  Integumentary\n5.  Muscular \n6.  Nervous: \n7.  Reproductive\n8.  Respiratory \n9.  Skeletal\n10. Urinary/Excretory: \n\nthere's 12 but I left out 2, sorry, dont want to double check to find the other two, look urself...
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Sadly according to Oceanlink, a Candian science website, there is no one life cycle.  Different types of mollusks can have very different life cycles.
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nvertebrates are an extraordinarily diverse group of animals that include over 30 phyla. Invertebrates do not have a backbone, nor a bony skeleton. This large group of animals includes sponges, cnidarians, flatworms, roundworms, segmented worms, mollusks, echinoderms, and arthropods.\nSubtopics\nArthropods (290) Flatworms (6) Cnidarians (6) Mollusks (9) Echinoderms (7) Segmented Worms (5)
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Gall bladder, tonsils, appendix, one lung, one kidney, arms, legs, several lymph nodes, external genitals, reproductive organs, nose, tongue, teeth, ears, small carefully chosen pieces of the brain, turbinates, eyes, many nerves, most skeletal muscle, a considerable amount of intestine, larynx, lower jaw, many endocrine glands.\n\nThe list gets longer if it's okay to be on life support.
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Mouth, stomach, intestines.
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Arms, legs, neck, abdomen, upper torso.
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<>Actually, this is not as easy as I thought it would be.  Here're a couple sites to look at.  I'll see if I can find more.\nPS: I guess it would be easier if you were to specify a particular bivalve.  There is a variety of articles on different ones here:\nhttp://www.student.loretto.org/zoology/Bivalve.html\nhttp://cars.er.usgs.gov/Region_5_Report/html/bivalves.html\nhttp://www.esg.montana.edu/dlg/aim/mollusca/bivalve.html\nhttp://www.chesapeakebay.net/info/hard_clam.cfm\nhttp://www.aquaticinvaders.org/nan_browse.cfm?level=4&key=030201000000\nhttp://www.aquaticinvaders.org/nan_browse.cfm?level=4&key=030201000000
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Lobster.  Crab.  Oysters.  Clams.  Mollusks.  Scallops.  Shrimp.  Krill.  Barnacles.  Crayfish.