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 elephant may grow up to 24 of these teeth, each weighing in at about 9 pounds. Elephants typically have 4 sets of these teeth at any given time. In cases where the teeth may get stuck and donât easily fall out, the elephant will chew on tree trunks and old tires to loosen them up. Once this cycle is complete, and the elephant can no longer grow any new teeth, the elephant dies from starvation.