: When studying river habitats, it is important to understand the interdependence and interconnections among many types of plants and animals that share an ecosystem. Underwater habitats are difficult to visit in person. The Illinois State Museum's new first-floor exhibit, Changes , opening in 2004, offers an opportunity to view such a habitat in the form of a life-size diorama. Students could do this activity as a post-museum-visit lesson to reinforce what they learned. If students are unable to visit the museum, their making this diorama gives them an opportunity to visualize the habitat they are studying. Also see other ISM lessons on mussel anatomy and life cycle. The diorama could be an individual or group project and vary in size accordingly.