easy · Enhanced ACT science
An experimenter tests the effect of different light wavelengths on the rate of oxygen production in Elodea plants. She uses three identical tanks, each containing 500 mL of water, and exposes them to red, blue, and green light. She measures the volume of oxygen bubbles produced every 10 minutes.
In this experimental design, what is the dependent variable?
- The measured volume of oxygen bubbles
- The 500 mL volume of water in the tanks
- The type of plant species used in the test
- The wavelength of light used in each tank
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