Your answer is Enamel it is the coating on teeth that helps prevent damage.
I believe that it consists of about 3 billion letters/base pairs
The central portion of Earth is called the CORE
The tongue muscle that the child uses when she sticks her
tongue out is the genioglossus. This is the muscle of the tongue that is
responsible for making the tongue to stick out or protruding the tongue of an
individual.
Cells don't grow very big because they have to be able to diffuse through material easily. Also, when cells are small and plentiful they are easy to replace when damaged.
