Drag each tile to the correct box arrange the events in the order they would have occurred according to the theory of endosymbiosis

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.

allowed for the prediction of the properties of missing elements.

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.