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.
Elephants have a total of four teeth and a single tooth can weigh more than 5 kg. A typical elephant tail can weigh 10 kilograms. An adult elephant eats about 75 to 150 kg of food each day, which is about size of an ordinary human. A newborn elephant is about 1 m high and weighs about 120 kg. By the time the calf reaches the age of 10 they already weigh the same as an average car, about 900 to 1300 kg.