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Whitehall's Angela Nguyen, 11th grade, paces off a distance to measure a tree as The Lehigh County Conservation District and Wildlands Conservancy hosts the 25th Annual Lehigh County High School Envirothon at the Pool Wildlife Sanctuary in Emmaus on Thursday. The Envirothon is a competitive environmental education program conducted at the local, state, and national levels for high school students.MICHAEL KUBEL / THE MORNING CALL