Which the following descriptions would be an example of exocytosis? Which the following descriptions would be an example of exocytosis? A. a macrophage imbibing its surrounding tissue fluid and nutrients cholines B. reabsorption by a neuron a low-density lipoprotein that becomes internalized by a hepatic cell acetylcholine released from a neuron bacteria that is engulfed by a white blood cell

Acetylcholine released from a neuron

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.