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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
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Comment
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1
answer:
Alchen
[17]
3 years ago
7
0
I believe the answer is the second one.
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