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.
The adult horse has 40 teeth, which consists of 24 molars, twelve incisors and a male horse has four tusks. Sometimes the horse may also have four wolf teeth. One year: The horse has six new milk teeth in each jaw. Two years: The horse has a complete set of milk teeth which are now worn.