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.
Males have huge tusks, which are actually incisor teeth made of ivory that can measure up to 5 feet in length. The elephant uses these tusks to dig for food, clear debris, and carry logs up to 1 ton in weight. These tusks are very unique. The only other animal that has ivory tusks is the walrus.