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.
However, some people have as many as six wisdom teeth and others have none. They can also begin to come in as early as 13 or as late as 25. Most people have their wisdom teeth removed to prevent overcrowding and discomfort. Most healthy adults end up with 28 teeth after their wisdom teeth have been removed. But many will lose some of these over time. How many Teeth Do Adults Need?