3-4 Ecosystem Recycling • Water cycle- Cells contain 70-90% water for chemical reactions to occur. • Carbon cycle- part of organic materials (glucose) that living things use for energy • Nitrogen cycle- Nitrogen is used for the building of proteins (amino acids) and Nucleic acids. Water cycle Carbon Cycle Nitrogen cycle • Nitrogen fixation=N2 into Nitrates (bacteria do this for plants to use) • Ammonification=decomposers break down the Nitrogen in dead material into ammonia. • Nitrification=Bacteria take up ammonia and oxidize into nitrates and nitrites (plants use this for amino acids) • Denitrification=anaerobic bacteria break down nitrates and release N2 back in the atmosphere. Nitrogen Cycle
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