But fortunately for most of us, the immune system is constantly on duty to battle germs that could make us ill. The following discussion questions and activities will help your students learn about how the immune system protects them from germs and illness.
Elephants however, go through six sets of 9lb teeth during their lifetimes, with new teeth growing in to replace old ones that have worn out. An elephants starts with two front teeth that fall out after about a year and are replaced by a set of tusks.
How many teeth should there be on the upper jaw of an adult? A human adult can have anywhere from 14 to 16 teeth in the upper jaw. 14 would be considered the minimum with the possibility of the other 1 or 2 teeth being the development o â¦ f third molars; teeth which are commonly called wisdom teeth.