they never change their shell and they can be eaten.
In France and Spain they are considered a delicacy. The texture is a little strange, but various sauces give them various flavors. They'll always be yummy to me.
Apple snails are freshwater aquatic snails. Garden snails are land snails.Apple snails have lungs and gillsGarden snails have lungs onlyApple snails skin is thin and translucent (with slime)Garden snails skin is thick and leathery (with slime)All apple snails have two sets of antennaeGarden snails have species with one and two sets.
water snails but not regular snails
Sea snails Freshwater snails
Apple Snails will eat other snails if you don't feed them. If you feed them, then they are alright.
Snails do not have bristles. Snails do have a raspy tongue though.
no snails are not harmful.
Snails are invertebrates. :)
snails are hervibores?
Squids doesn't have lungs, they have a structure that does the same thing as the gills do for fish, take up oxygen from the water. W/o lungs, the idea of holding their breath becomes a bit strange. The closest comparison - how long a squid can go w/o new water over its gills - I have no idea.
the protein from the other snails shells
Many species of land or aquatic snails exist.