Why do living things need nitrogen?
To get energy
To make amino acids
To make proteins
To make proteins AND amino acids
What cycle are fossil fuels part of ?
carbon
oxygen
nitrogen
phosphorus
What is the largest reservoir for water?
the ocean
rocks and minerals
the atmosphere
glaciers
Where is the largest reservoir for the phosphorus cycle?
rocks and minerals
the ocean
the atmopshere
fossil fuels
What is the largest reservoir for nitrogen?
the ocean
rocks and minerals
the atmosphere
bacteria
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