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Biology, 13.01.2020 17:31 abc236

2points
which are forms of nitrogen that are usable by humans?
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a. ammonia, nitrates, nitrites
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b. oxygen, carbon, water
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c. nodules, roots, fertilizer
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d. phosphorus, nitrates, nodules

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2points
which are forms of nitrogen that are usable by humans?
o
a. ammonia, nitr...

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