AP BIOLOGY

Detailed explanation-1: -The stages are: Pioneer Species: These are the first species to begin colonizing the ecosystem. Intermediate Species: Once the pioneer species colonize the area, this species begins to emerge. Climax community: This is the stage at which a more stable ecosystem begins to emerge and homeostasis is achieved.

Detailed explanation-2: -Secondary succession happens when a climax community or intermediate community is impacted by a disturbance. This restarts the cycle of succession, but not back to the beginning-soil and nutrients are still present.

Detailed explanation-3: -In secondary succession, a previously occupied area is re-colonized following a disturbance that kills much or all of its community. A classic example of secondary succession occurs in oak and hickory forests cleared by wildfire. Wildfires will burn most vegetation and kill animals unable to flee the area.