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.
Typical geckos have close to 100 exposed teeth at birth and continuously replace them every few months (3). Leopard Gecko Tooth Replacement. Leopard geckos have tooth âfamiliesâ that form rows in the lizardâs mouth. Within these rows, new generations of teeth form constantly from before hatching until death. The replacement teeth are formed in the successional lamina and develop lingual (towards the tongue) compared to the erupted teeth. Each replacement tooth grows in size until it eventually surfaces from inside of the tissue and displaces the tooth in itâs place. This turnover process usually takes between 3 and 4 months (3).