Question

PLEASE HELP WILL MARK BRAINLIST WHEN I CAN. Why is it important that you keep two variables constant (such as light level and color) while you're testing how a third variable(CO2 level) affects photosynthesis​

Answer 1

If you change two of the three variables than you don’t know if the change is caused by variable A or variable B. In this case if you keep light constant but change the amount of co2 and the color of the light, you can’t which of these two are affecting photosynthesis.