In 2012, the United States produced 2,068 million metric tons of CO2 from electricity alone. Let x be the amount of CO2 produced by the United States that year from transportation. Based on the chart, what equation can be used to solve
for x? Units are in million metric tons.

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.

answerpalpalis group;