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.
The sea lion has between 34 and 38 teeth which include incisors, canines, premolars and molar teeth. 1  The incisors at the front of the mouth of the sea lion are quite small but are very sharp and are used for biting down on and holding onto prey.