A student sets up an experiment with two plants that are each exactly five inches tall. One is given fertilizer and the other is not. After 4 weeks their height is measured again. What is wrong with this experiment? A) There is no control for this experiment. B) Plants grow slowly. The time frame is too short. C) The plants need to be taller to get accurate measurements. D) Plants naturally grow at different rates. More trials need to be done.
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