Determine the composition of trees in a forest

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Determine the composition of trees in a forest

Question: A class of environmental science students decided to determine the composition of trees in a forest next to their campus. The students decided to conduct a point-quarter survey. When they reached the study area they found that the east side of the woods was thick with blackberry bushes. The bushes had a lot of thorns and were difficult to maneuver around. The students decided to move to the west side of the woods to do their survey. What wrong with this scenario?