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.
Crocodiles have 60 teeth in their mouth at any one time and can grow up to 2-3,000 teeth during their lifetime. Poisonous snakes have hollow fangs which eject poison. Giraffes have 32 teeth, just like humans. Elephants have four sets of teeth in their lifetime.