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Effect of Ethanol on the Daphnia heart rate In this experiment we will be looking at the effects of different concentrations of ethanol on the heart rate of the water flea, Daphnia. This small freshwater crustacean is relatively transparent; this allows their heart rate to be recorded clearly by simply observing them through the microscope. The experiment consists in preparing 5 different environments to put the water flea in, and observe how the heart rate responds to each change; the change will be the increase of ethanol concentration %. This will be the independent variable. The dependent variable is the heart rate of the Daphnia. The materials needed to perform this experiment are the following: * Normal size syringe * 2 Small syringes (must have units of measurement) * Open top pipette * Ethanol of 1% concentration * *Various Daphnia to perform experiment on * Microscope * 6 Petri dishes * Cavity slide * Marker * Paper *...

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