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Maurinko [17]
3 years ago
5

Help is needed for this question plz

Biology
2 answers:
kirza4 [7]3 years ago
6 0
The answer is d the last one
nevsk [136]3 years ago
4 0
The answer is D. To test the growth of alfalfa plants with and without nitrogen rich fertilizer
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Explanation:

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Each organism in an ecosystem occupies a specific trophic level or position in the food chain or web.

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