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.
Mature male horses have 40 -42 permanent teeth and mares have 36-40. depending on the number of canine teeth present Table 1. Canine or bridle teeth. erupt in the inter dental space at 4-5 years of age in male horses. They will only. appear 20-25% of the time in mares and are usually smaller than those found in. males.