The minimum age to obtain one's driverâs license should not be raised to 18 because 16-year-olds have a much more focused mind. If you change the minimum driving age to 18, it will be very little different from 16-year-olds because either way they wouldn't have very much driving experience.
Snails make their own shells.They make it with a muscle called the mantle.The mantle then releases liquid.When the liquid hardens it forms the shell.Later in the snails life t â¦ he mantle releases more liquid and the shell becomes bigger.
In some mollusks, they have a shell. The shells is made of calcium carbonate and consists of chitin and conchiolin. The shell has three layers: outer layer made from organic matter, middle layer made of columnar calcite and inner layer of laminated calcite.