A science student observes that a dissolvable inside tablet ask pastor and a feeling stomach pain when taken with warm water than when taken with water at room temperature. Based on the observation, suggest a potential problem that can be studied. Also, what is the dependent, independent, and control variables that can exist in such an investigation. 

"the periodic table is arranged in order of atomic number."

to improve her experimental investigation, dalila should add a row in which no fertilizer is used. by a having a contrasting row in which no fertilizer is used, she will have a control group that will her understand the effects of the fertilizer in the plant developments vs the development of the plant when no fertilizer is used.