The statement ''they can no longer support their own weight'' is a prediction and the scientist has to verify this prediction by performing different experiments on the plant. The scientist has to take a plant and placed in dark in order to see the fall over of plant. If the plant fall over so the we can say that the prediction was right while if the plant did not fall over so it means the prediction was wrong.
Explanation: Methamphetamine is a potent central nervous system(CNS) stimulant that is mainly used as a recreational drug and less commonly as a second line treatment for attention deficit hyperactivity disorder and obesity.
