What determines whether regeneration or fibrosis occurs?

Whether regeneration occurs depends on (1) the regenerative capacity of involved cells (ie, their ability to divide), (2) the number of surviving viable cells, and (3) the presence of a connective tissue framework that will provide a base for restoration of normal tissue structure.

carbon

explanation:

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.