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.
The Class Gastropoda includes snails and slugs. Most gastropods have a single, usually spirally coiled shell, but the shell is lost or reduced in some groups. Many snails have an operculum, a plate that closes the gastropod's opening.Shelled gastropods have mantles, while those without shells have reduced to absent mantles. Gastropods have a muscular foot used for creeping in most species. In some, the foot is modified for swimming or burrowing.Most gastropods have a well-developed head that includes eyes at the end of one to two pairs of tentacles.any snails have an operculum, a plate that closes the gastropod's opening. Shelled gastropods have mantles, while those without shells have reduced to absent mantles. Gastropods have a muscular foot used for creeping in most species. In some, the foot is modified for swimming or burrowing.