General Science Question:
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An experiment is testing whether a certain water-based plant fertilizer helps plants grow better. The experimental group contains plants that are given 20 milliliters of the fertilizer per day. Which of the following would be the best control in this experiment:

Answer:

1. an equal number of plants that received nothing in place of the fertilizer
2. an equal number of plants that received 20 milliliters of pure water in place of the fertilizer
3. an equal number of plants that received twice as much fertilizer
4. there is no need for a control

Answer: B

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