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.
Camels have several different kinds of teeth, distinguished by their location in the mouth and their purpose. They have incisors, canines and molars, or premolars in baby camels. A camel has eight incisors, six in the lower jaw and two in the upper jaw, and 12 molars -- three on each side of the mouth, in both the upper and lower jaws. Tooth wear serves to help determine camels' ages, but a camel's environment must be factored in, because it determines the animal's diet and consequent effect on the teeth.