Question

what are the main differences between primary and secondary succession?

Explanation:

Primary succession occurs in lifeless areas (no soil), like after volcanic eruptions. It starts with pioneer species (e.g., lichens) to build soil. It takes a long time. Secondary succession happens in areas where a disturbance (e.g., fire) removes organisms but leaves soil. It has a faster progression as soil and some organisms (seeds, roots) remain.

Answer:

Primary succession: occurs in lifeless areas (no soil), starts with pioneer species (e.g., lichens) to build soil, long - term. Secondary succession: occurs in areas with soil remaining after a disturbance (e.g., fire), faster progression as soil and some organisms (seeds, roots) are present.