Dependant variable: the number of oxygen bubbles given off (the rate of photosynthesis). Controlled variables: the size of the pondweed, the volume of water used and its temperature. Below are a ...
Dependant variable: the number of oxygen bubbles given off (the rate of photosynthesis). Controlled variables: the size of the pondweed, the volume of water used and its temperature. Below are a ...
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