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 cheetah has a total of 30 teeth; the dental formula is 3.1.3.13.1.2.1. The deciduous dentition is 3.1.23.1.2. The sharp, narrow cheek teeth help in tearing flesh, whereas the small and flat canine teeth bite the throat of the prey to suffocate it.