The regulates the amount of glucose circulating in the blood by either synthesizing glycogen or breaking down glycogen.

Glucagon

Explanation:

It is a peptide hormone secreted by the pancreas, raises blood glucose levels

Glucagon stimulates glycolysis, the breakdown of glycogen and the export of glucose into the circulation

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.