how is the mollusks shell  made?
156968
hello? this is b-ball category?
767503
Snail shells can be either right-handed (as you\nhave described) or left-handed, although the\nright-handed ones are much more common.  Even\nin the same species of snail an occasional one\nwill come out with handedness opposite to the\nusual.  The handedness seems to be fixed by\nthe tilt of the spindle during the earliest cell\ndivisions of the embryo.  If the spindle leans one\nway the result is a right-handed shell, if it leans the\nother way, left-handed.  Why right-handed is more\ncommon no one seems to know.  It may be just\na historical accident.
682182
the main structural support of the squid comes from a structure called a pen.  the hypothesis is that it is a remnant of the molluscan shell.
402763
The main ingredient in eggshells is calcium carbonate (the same brittle white stuff that chalk, limestone, cave stalactites, sea shells, coral, and pearls are made of). The shell itself is about 95% CaCO3 (which is also the main ingredient in sea shells). The remaining 5% includes calcium phosphate and magnesium carbonate and soluble and insoluble proteins.
683530
the shell turns into a rubber-like substance eventually
2787
Molluscs have an organ known as a mantle. It is the body wall covering beneath the shell. The outer layer of this organ secretes calcium carbonate using calcium from its blood. They can also secrete some proteins which give the shells colors and patterns while the mollusc is living. The inner layer of the shell is composed of nacre, which is a composite of calcium carbonate and organic materials. This is the material that makes the inner part of the shell iridescent, and the coating that makes pearls.
418312
nothing will happen, it will just get soaked. But if you used acid or diluted acid it will become more thin. Acid will eat away the shell.
245877
Most sites just say "ink".  But this is the closest I came to finding out what it is made of:\n\nThe ink is almost pure melanin and does not dilute in sea water. The ink is contained in an organ called the ink sac which is located near the rectum and is unique to cephalopods.\n\nWell, I did not find an exact answer, but I sure learned more about squids and octipus then I ever needed to know.
888179
Because there are two strong muscles called adductor muscles which hold the two shells together. Once you get the shell open (by steaming the clams for example), and remove the clam from the shell, you can see on the inside of the shell the two rather shiny areas where the two muscles were attached. In fact, sometimes the muscles don't even detach from the shell during steaming, which makes removal of the clam from the shell difficult even after it is open.\n\nhttp://universe-review.ca/I10-82-clam.jpg\n\n.
145144
The shell covering an egg is porous !!.It allows Oxygen to enter into the egg and CO2 to move out of the egg!
1037984
Pearls come from a group of water organisms called pearl molluscs, which includes oysters, mussels, and clams from both freshwater and saltwater. The pearl itself actually begins as an irritant. Sand, a pebble, or a pesky parasitic organism gets inside the oyster's shell. To reduce the irritation, the oyster coats the intruder with layers of a solid, slick material called nacre. \n\nThe oyster's mantle tissue secretes the two main components of nacre: thin layers of the mineral aragoniteand a gluelike substance called conchiolin, which cements the layers together. Because the aragonite is translucent, light interacts with the overlapping layers to give the finished pearl its lustrous appearance. Pearl molluscs also coat the inside of their own shells with nacre, so some shells picked up at a seashore are shiny and iridescent inside.
22527
Slugs don't "melt" when salt is poured on them; they simply dry out.  Slugs depend on being very moist to survive, and if they lose that moisture they die.  Salt is known for being very good at removing moisture from cells, so when you combine salt and slugs, you have a dried slug.
945600
Well, all of these answers are correct to some degree.  Early shells were made of other materials and had the problem of sticking in the chamber.  The specific alloy used for cartridge cases was developed so that it would expand when fired causing the chamber to seal.  Equally important was the characteristic that it contracts back to near its original dimensions so that it can be easily extracted from the chamber.  Additionally it has a natural lubricity which makes it easy to remove from the chamber as well.  Being a non-sparking material was less of a consideration than having a material which would not stick in the chamber and was soft enough that it could easily be reformed and could be reused.
701844
Snails are mollusks; that puts them in the same phylum as clams, oysters and cuttlefish.
308895
Um, mollusca is not a class...\n\nMollusca is a phylum, and bivalvia is a class under that phylum. \n\nThe major mollusk classes are Gastropoda (snails and slugs),  Bivalvia (clams, mussels, and shipworms), Cephalopoda (squid, octopuses, cuttlefish, and nautilus), Polyplacophora (chitons), Scaphopoda (tooth shells), Monoplacophora (a single-shelled animal), and the little-known Aplacophora (a questionable mollusk).\n\nBivalves have two shells, or valves, that are compressed on either side of the body. The shells are made from the excretions of the mantle as in gastropods, but are very different in shape and some functions.\nThe two shells enclose most of the body, and strong muscles inside the shell keep the two valves tightly closed. The shells open only to take in and release water or to allow the foot to extend into the sand.
457718
Hmm. I don't think seashells are formed from sands. Seashells are marine creatures to be exact, marine snails. Though I have yet been able to verify, I believe the reproduction process of seashells are similar to that of a snail. That is some seashells are hermaphrodites, producing both spermatozoa and ova, others are either male or female. They inseminate each other to internally fertilize the ova, thus producing fertilized eggs.
155798
The shell is the entire outside and the structure that holds it up.