... could be used to count the number of bubbles coming from the elodia. A new piece of elodia needs to be used every time a new coloured light is used and it must be the same length every time. Many aspects must be taken into account during this experiment to make it fair. The temperature must be kept constant. To do this no natural light must get in and an average of temperatures must be taken at different times in case it changes. The size of the plant used must always be the same so it is a fair test. The intensity of the light must always be the same so the power level must be the same and a new bulb could be used each test so the filament in the bulb is always at the same level at the start of each test. Carbon dioxide levels must try ...

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