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.
1 Common types of shells include sea shells, snail shells, turtle shells and eggshells. 2  There are more than 50,000 varieties of mollusk shells. 3  Some open like clam shells, while others are shaped in a spiral and have a single hold where the animals enters and exits the shell.