Life on Earth 0.0 / 5 ? BiologyLife on EarthAll LevelsSQA Created by: amydawsonnxCreated on: 11-03-15 18:40 32451 Across 1. Converts nitrates to nitrogen (12, 8) Down 2. An organism that obtains its food from dead or decaying matter (9) 3. Converts ammonia to nitrites and nitrites to nitrates (10, 8) 4. A natural process that occurs in all ecosystems. (4) 5. An element needed for the production of animal and plant proteins (8)
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