Which statement best describes the role of mrna in protein synthesis? stores the genetic code in the nucleus. splits the dna molecule into two strands. carries an amino acid to the ribosome. copies the genetic code from the dna molecule and carries it to the ribosome.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.