Question

moss grows where there was previously only rock. which situation describes this example?
a pioneer species in primary succession
a pioneer species in secondary succession
a climax community in primary succession
a climax community in secondary succession

Explanation:

1. Recall ecological succession: Primary succession starts on bare rock (no soil), secondary on disturbed soil (e.g., after fire).
2. Pioneer species are first to colonize barren areas. Moss colonizing rock (no prior soil) is primary succession's pioneer.
3. Climax community is stable, final stage (not moss here). Secondary succession needs pre - existing soil, which rock - only lacks. So moss here is a pioneer species in primary succession.

Answer:

a pioneer species in primary succession