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.
There are four different types of teeth: 1  Incisors. These are your four front teeth on the top and bottom jaw. 2  Canine teeth. These are sharp, pointy teeth. 3  Premolars. Next to your canine teeth are your premolars (also called bicuspid teeth). 4  Molars. You have eight molars: four on top and four on the bottom.