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Grades 5-12. For a class of 32 students. Measure the effect of acid precipitation on plant growth and productivity. Experiment time is 45 days. Note: For sale to educational and research institutions only.
Grades 5-12. For a class of 32 students. Measure the effect of acid precipitation on plant growth and productivity. Experiment time is 45 days. Note: For sale to educational and research institutions only.
