How can humans reduce nitrogen contamination of ground water? Using the nitrogen-cycle identify one pool of nitrogen and one way in which nitrogen moves that humans have at least partial control over.

Dna in the nucleus carries the genetic code for making proteins in ribosomes. the diagram shows a model of dna. which part of the dna molecule codes for the amino acid sequence in the protein? a) sugar b) phosphate c) deoxyribosed) nitrogen bases