The constents would be anythign that stays the same in ever experiment.
Example: Growing sunflowers in different liquids
The constants could be: Type of dirt used to grow each, amount of liquid used to water, and the type of sunflowers grown.
Answer:
The substance which responds to the change in the concentration of the hydronium ions in solution by changing its color is known as an indicator.
I found this so this might help you
Answer:
imma go with the answer B
