Designing a controlled experiment?

With two nearby ponds in a forest as your study site, how would you design a controlled experiment to measure the effect of falling leaves on net primary production in a pond?Designing a controlled experiment?
For best control:


Establish a baseline history of both ponds measured production.


Net or otherwise prevent the fall of leaves into the test pond.


Maintain measurement of both control and test pond production and compare both with each other and history to rule out extraneous factors.Designing a controlled experiment?
Do this and it may help you understand the question





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Good luck.