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.
Horse teeth are different. They get baby teeth, and then permanent teeth, but horse teeth also have very long roots, which, over the course of the horseâs life, âerupt,â the same term as is used in talking about volcanoes.