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Help is needed for this question plz

Help is needed for this question plz
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5 votes
Help is needed for this question plz

Help is needed for this question plz-example-1
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User Lupl
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2 Answers

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The answer is d the last one
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User Cameron Sima
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The answer is D. To test the growth of alfalfa plants with and without nitrogen rich fertilizer
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User Mats Fredriksson
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