fertiliser, lightning, nitrate in soil, protein in dead animals and waste, eaten by decomposers, turned into animal protein when eaten, protein in dead plants, protein turned into nitrates by decay, nitrates added by farmers, nitrates absorbed (taken up) by plants, nitrates formed when N and O react, plant proteins, bacteria and fungi (decomposers), proteins in dead material, animal proteins.

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Bytt mal

Gjenopprett automatisk lagring: ?