I created this activity to help my students meet performance expectation (HS-LS2-8) about how group behavior is selected for by natural selection. I do this activity after students have had time with natural selection and we have explored various examples. Then, I ask them the question, "Why would organisms help each other if there is a battle for survival going on"? We brainstorm together and then I introduce them to the activity and split them up into four teams. Approximate time length for the entire activity is about 90 minutes.