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.
1 Horses have teeth that continue to erupt for 20 to 30 years. 2  These teeth are called a âhypsodont.â. 3  The horseâs front teeth are called incisors. 4  These are the teeth the horse uses to pull grass. 5  There are 6 on the top and 6 on the bottom of the mouth. 6  Canine teeth are usually only present in male horses. If they have a complete set, which is rare, they would have 44 teeth. 2  Horses have teeth that continue to erupt for 20 to 30 years. 3  These teeth are called a âhypsodont.â. 4  The horseâs front teeth are called incisors. 5  These are the teeth the horse uses to pull grass.