A student wanted to investigate the effects of different types of fertilizer for a science fair project. There were two plants used: plant A (chemical fertilizer) and plant B (organic fertilizer). The student measured the height of the plants and recorded the observations. Which of the following would be a good revision to the procedures of this experiment?
A) Increase the number of plants used in the experiment
B) Use a different type of fertilizer for plant A
C) Measure the weight of the plants instead of the height
D) Record the observations at different time intervals