Seven steps of primary succession

there are not 7 steps of primary succesion and they only have 4 steps.

Explanation:

The complete process of a primary autotrophic ecological succession involves the following sequential steps, which follow one another:

Nudation:

Invasion:

Competition and reaction:

Stabilization or climax:

frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.