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valentinak56 [21]
3 years ago
5

A student wants to test the effect of nitrogen rich fertilizers on the growth of rose bushes. Which of the following is a variab

le that must be kept constant?
Growth of the rose bush
Amount of water the rose bush receives
The use of nitrogen rich fertilizer
Biology
1 answer:
Alchen [17]3 years ago
7 0
I believe the answer is the second one.
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