Question

why does secondary succession occur faster than primary succession? f fewer changes must occur in secondary succession. g there are more pioneer species in secondary succession. h the environmental conditions are more extreme in primary succession. j there are more trophic levels in secondary succession.

Explanation:

To determine why secondary succession is faster than primary succession, we analyze each option:

• Option F: Secondary succession starts on soil that already exists (e.g., after a fire or disturbance that doesn't destroy the soil), so fewer changes (like soil formation, which is a major part of primary succession) are needed. This makes sense.
• Option G: Primary succession has more pioneer species as it starts from bare rock, so this is incorrect.
• Option H: While primary succession can start in extreme environments, the speed difference is mainly due to soil presence, not just extreme conditions. This is not the main reason.
• Option J: Trophic levels develop over time, and secondary succession is faster because it starts with soil, not because of more trophic levels initially. This is incorrect.

Answer:

F. Fewer changes must occur in secondary succession.