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.
Secondly, they provide. rigidity and shape. One well-known group of animals that secrete shells is called mollusks. There are eight classes of mollusks grouped according to the. characteristics of their shells. Single-shelled organisms are ca lled. Gastropods. A snail is a gastropod, with a single shell that. spirals outward and to one side as it grows.