Laura performed an experiment to determine the effect of nitrogen-rich fertilizer on plants. The procedure she used in her
experiment is shown below.
1. Select a plant for the project
:
2. Add 5 Tbsp. nitrogen-rich fertilizer to the plant's soil each week
3. Measure plant growth each week
4. Calculate the total growth at the end of a 6-month period
What is wrong with Laura's experiment?
A.
She did not measure how much fertilizer she was giving the plant.
B. She did not use a second plant as a control.
C.
She did not measure the plants growth daily.
D.
She did not set a time limit on how long she was going to continue fertilizing the plant.
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