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 a 11 year old have? Between the ages of 9 and 11, the final permanent teeth should be in place, for a total of 28 teeth. Some conditions can affect the number or spacing of teeth. The final 4 thiâ¦rd molars (wisdom teeth) will erupt around the ages of 17 to 25.