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.
An adult person who has all his or her adult teeth should have a total of 32 teeth. These include 8 incisor teeth (four upper and four lower), 4 canine teeth (two upper and two lower), 8 premolars (four upper and four lower), and 12 molars (six upper and six lower). The 4 wisdom teeth are among the molars. A child, who is younger than 6 years old, usually has 20 deciduous teeth.