## There are many organisms that may seem exotic, yet they provided essential information about fundamental biological principles

So far, we briefly introduced organisms that can be considered as “conventional”. This adjective is substantiated by the fact that their use in scientific investigations resulted approximately forty Nobel prizes. However, the list of model organisms does not end here. In fact, there are dozens of species that, for one reason or another, have been exploited in understanding various biological phenomena. Examples of such organisms are provided in Figure 20.10.