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29 December, 12:02

A student wants to test the effect of nitrogen rich fertilizers on the growth of rose bushes. Which of the following is a variable that must be kept constant?

Growth of the rose bush

Amount of water the rose bush receives

The use of nitrogen rich fertilizer

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Answers (1)
  1. 29 December, 14:05
    0
    I believe the answer is the second one.
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