This is one station that data that the students need to graph on a double line graph. They have to decide if the graph is an example of directional, disruptive or stabilizing selection. This is 1 of 4 stations that I have my students do during the natural selection/evolution unit.
This PowerPoint which includes Speaker notes goes over the similarities and difference between the Brown Bars and Grizzly Bears which occupy the Greater Yellowstone Ecosystem (Idaho, Montana, and Wyoming).
This can be used for all ages.