Brief: In this Next Generation Science Standards Aligned lab, students write rules for a game that simulates how a food chain works. They play two games: In Game 1, they play their first iteration of rules, taking 12 rounds of population data, and graphing the data. In Game 2, students play revised rules; tweaking their original set of rules to make the game a better model for a real ecosystem. They, again, graph their data, and analyze the results by answering conclusion questions. This ac