Answer:
4.a change in species on a site over time.
Step-by-step explanation:
- The ecological succession s best described as the changes in the structure of the species over time. And this time scale can be decades, months and years depending on the community of the area.
- As the community begins with the pioneering plants and animals that develop through an increasing complexity of stages and becomes self-stable and climatic climax. And through the development of the phases that are called as the sere that give a predictable and orderly change.