Microcosms are artificial, simplified ecosystems that are used to simulate and predict the behavior of natural ecosystems under controlled conditions. Open or closed microcosms provide an experimental area for students to study natural ecological processes. Microcosm studies can teach the ecological roles and interdependence of key species to sustain life. Biosphere 2 was a microcosm made for self-sustained human living in preparation for the day humans will have to develop microcosm in space or other planets to stay alive. (Wikipedia) In this class, students will make their own aquatic microcosms.