What is the main difference between primary and secondary succession?

Question

Responses

Primary succession occurs in areas following a weather-related phenomenon, while secondary succession occurs after glaciation.
Primary succession occurs in areas following a weather-related phenomenon, while secondary succession occurs after glaciation.

Primary succession occurs in areas following a natural disaster, whereas secondary succession occurs after human activities have altered the area.
Primary succession occurs in areas following a natural disaster, whereas secondary succession occurs after human activities have altered the area.

Primary succession begins where only autotrophs are still present, whereas secondary succession begins where there are also heterotrophs
Primary succession begins where only autotrophs are still present, whereas secondary succession begins where there are also heterotrophs

Primary succession begins in areas where there is bare rock, while secondary succession begins in areas where the soil is relatively intact.

Answer 1

The main difference between primary and secondary succession is that primary succession begins in areas where there is bare rock or no soil, such as after a volcanic eruption or the retreat of a glacier, while secondary succession occurs in areas where the soil is relatively intact, typically after disturbances like fires, floods, or human activities that do not remove the soil. Therefore, the correct response is:

Primary succession begins in areas where there is bare rock, while secondary succession begins in areas where the soil is relatively intact.