easy · Act science
A biologist studies the effect of light wavelength on the rate of photosynthesis in Elodea plants. She uses three light filters: red, green, and blue. She counts the number of oxygen bubbles produced per minute while keeping the light intensity and water temperature constant.
What is the independent variable?
- The intensity of the light source used
- The number of oxygen bubbles produced
- The wavelength (color) of the light filters
- The temperature of the water in the tank
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