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Hayden is testing how well pine trees of Arizona grow in the shade. He planted pine seedlings in a greenhouse in either full light, light reduced to 25%, or light reduced to 5% normal. At the end of his study, he dried the trees and weighted them. Identify the explanatory and response variables and the treatments.
What are pine seedings? What are light intensity and dry weight at the end of the study? What are full light, 25% of the light, and 5% of the light?