MARQUETTE - The Glenn T. Seaborg Center at Northern Michigan University presents "Our Changing Planet," the next exhibit in the SBC Ameritech "Adventures in Discovery" series.The exhibit begins with a general introduction to biodiversity concepts and examines the endangerment of biodiversity due to natural and human factors. It also focuses on the plants and animals that inhabit Michigan's various natural communities. A display features several samples of the more than 300 mosses and liverworts that grow in the state, which are on loan from the U.S. Forest Service. The exhibit then looks at changes taking place in Michigan's natural communities, including the long list of threatened and endangered species and efforts to repopulate the wolf and moose. It explores several non-native species that now infest our Great Lakes, such as the sea lamprey and the zebra mussel. The Michigan Sea Grant program and the U.S. Fish and Wildlife Service have loaned materials on exotic species in the Great Lakes. "Our Changing Planet" also examines the use of space-based exploration as an important tool for learning about changes in our planet. The exhibit runs through Aug, 2. It is housed in room 2702 of the West Science Building and is open to visitors from 8 a.m. to 4 p.m. Monday through Friday. To enhance understanding of our planet, the Seaborg Center will present videos from the Eyewitness series at 12: 1 0 p.m. every Tuesday and Thursday in the Mead Auditorium, room 2701 of the West Science Building. All videos are approximately 30 minutes in length. The first will be shown on Tuesday, June 25; none will be shown the week of July 1. For more information, contact the Seaborg Center at 227-2002.