Ecological succession are the natural gradual changes in the types of species that live in an area we may refer to ecological succession as either primary or secondary the graphic represents an example of primary succession which begins in an area that has no living organisms present. notice in the illustration the first organisms to inhabit the area undergoing succession are lichens and Moss. what a biotic feature restricts the growth of more diverse plants in this area.

The lack of topsoil inhibits the growth of more diverse organisms in the region.

Explanation:

Following catastrophic or destructive events, primary succession occurs with the growth of the microorganisms. Here a non-habitable area is exploited by a colonizing organism.  For instance, lichens and moss break down rock and decompose to add nutrients to sediment creating topsoil.

Ultimately, these make the environment more livable by nutrient cycling, weathering, etc., which ushers in secondary succession. Here over time, the cultures become more dynamic, more diverse and an ever-larger food web.

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.