Yes! The shell of a snail is just like our spine. Its true- do not try and remove at anything- the snail would die a slow and painful death!
The oldest part of a snail's shell is the center of the coil. When the snail grows, it grows outward
No, snails do not leave their shells voluntarily. Their shell is a part of their body and provides protection as well as structural support. If a snail's shell is damaged or destroyed, it can be detrimental to the snail's health and survival.
Cochlea
It depend on what type of Snail it is because most snail produce their own shells, so the type of snail matters because some snails grow shells quicker than others and have a chance of surviving than the ones that can't grow their shell as quick.
No; the shell grows as part of the snail.
The mouth.
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Note: I copied this answer directly from: http://rochester.kidsoutandabout.com/main-columns/nature/snailshells.html Snails are hatched from eggs. When they hatch, they eat most of the shell, but a small part of it stays with them and that is the beginning of their shell. As the snail grows, so does its shell -- in a spiral shape. New shell is added at the opening of the shell. In the center of the spiral is the part of the shell that the snail began life with. The shell is made from several layers. The thin outer layer is made from an organic substance known as conchiolin. The thicker layer underneath is formed from three layers of crystalline calcium carbonate, similar to the chicken egg of which you may be more familiar. The color of the shell depends on the types of food the snail is eating and also the type of snail.
In pieces yes, and the odor is most foul. If a snail remains unmoving for a couple of days and you still see a his shoe and wonder if he yet lives, simply pick it up out of the water and give it a sniff. It is unmistakable if it is dead. Snails grow their shells while crabs kill the snails for the shells or collect empty shells. As the snail grows so does it shell, where a crab must replace and upgrade its residence as it grows.
The only way I know of is to strip down the tank, sterilise everything and replace everything that can not be sterilised. A method of keeping snails under control is to have Clown Loaches or Puffer fish in the tank. They will seek out and eat the snails.
Its giant sweaty butthole.
Snails are born with their shell. As the snail grows, so does its shell -- in a spiral shape. New shell is added at the opening of the shell by the mantle. In the center of the spiral is the part of the shell that the snail began life with. The shell is made from several layers. The thin outer layer is made from an organic substance known as conchiolin. The thicker layer underneath is formed from three layers of crystalline calcium carbonate, similar to the chicken egg of which you may be more familiar. The color of the shell depends on the types of food the snail is eating and also the type of snail.