14. Artificial Selection

12-inch ruler. Recycled plastic bottles (3), 0.5 L to 1 L. Stakes and holders, as needed. Soda bottle cap with hole (3) (wooden splints and plastic straws) Plant vermiculite. Dechlorinated water or nutrient solution . Labeling tape and markers (for the reservoir) Black plastic to cover the water reservoir (3) Hand-held plastic magnifier ... ................
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