|Field Trip - Indiana Dunes National Lakeshore - 10 of 12
By Paul Katula, Dateline: GARY, Ind. (May 27, 2006)
Evidence of additional human activity:
Most human activity interferes with the natural succession. For this reason, park officials ask people to stay on the trails and not pick the flowers. The fact that people do trample on the sand and destroy things in the park is evidence that the study of biology is different from the study of, say, chemistry. Living systems do not exist in a tank or in a laboratory as much as in the real world, where humans build steel mills, play on the beach, and even draw graffiti.