Ricabarbie Ricabarbie

29-03-2017
Biology

contestada

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

Respuesta :

haleyj1639 haleyj1639

29-03-2017

I believe the answer is the second one.

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