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nirvana33 [79]
3 years ago
5

Which substances contain nitrogen?

Biology
2 answers:
Luda [366]3 years ago
5 0

Answer:

protiens

Explanation:

in protiens in cells have nightogen

Anuta_ua [19.1K]3 years ago
5 0

Answer:

A. Proteins

Explanation:

Urea is a by product of protein digestion.

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