Answer:
For better results = Validity= we should maintain other parameters constant, like temperature, pH and sun light.
Explanation:
When making an experiment like this, we must control other parameters that can change our results.
Temperature: Dissolved Oxygen can change due temperature, for example: colder water, more dissolved oxygen and viceversa.
pH: Algae can change its function when changing water´s pH , so, we must maintain this condition controled.
Sunlight: Algae is activated through sunlight, in this case, we must investigate which are the conditions required for the algae that we are using .
