Jacob set up an experiment as shown below ( in dark room). He took four readings by changing distance between the light source and the experimental set up. The results are shown in the table. Which of the following variables should be kept the same for the experiment to be a fair test?
A. Type of light source
B. Amount of hydrilla plant
C. Distance between light source and beaker
A and B only
A and C only
B and C only
A, B and C
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Answer:
A and C only
Explanation:
type of light source
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