Natural Gas provides approximately how much of the energy generated in the United states? 1/5

1/8

1/4

1/2

Hello!

The United States draws 81 percent of its energy as a whole from fossil fuels, but in 2017, natural gas and coal alone provided 61.8 percent of our electricity. So it would be 1/4.

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.

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.