How does any ecosystem transition from primary succession to secondary secession

Ecosystem transition: serious disturbances such as volcanoes, windstorms, fire, anthropogenic factors leads to ecosystem transition (i.e. primary succession to secondary succession). The ecosystem transition which donot eliminates entire life and nutrients from the existing environment.

for the points

prophase: we can observe the chromosomes to coil up and condense. they become visible. nuclear membrane and envelope disintigrate.s

metaphase: chromosomes align at the center, the metaphase plate. spindle fibers attach to centromeres of the sister chromatids. they meet at kinetochores.

anaphase: sister chromatids are pulled towards each opposing centromere, set on different poles.

telophase: chromosomes are now clustered up only on either sides of the cell. nuclear membranes reform, and a new cell wall forms along the cell plate. this will lead to cytokinesis, the process that divides the cell membrane and forms the cell wall.