Which term describes the sequence of ecological changes that leads from a barren area to a mature ecosystem?

• A. Ecological equilibrium
• B. Ecological succession
• C. Evolution
• D. Biome shift

Answer: (B)

Ecological succession describes how an area changes over time, progressing from barren ground or a disturbed site toward a mature, stable ecosystem. It covers the step-by-step replacement of organisms, from pioneer species that first colonize the area to later communities that establish lasting vegetation and soil structure, eventually reaching a more complex and balanced state. This sequence can begin on bare rock in primary succession or on cleared land where soil remains in secondary succession, with changes driven by interactions among species and the environment. In contrast, ecological equilibrium refers to a stable balance in a system, not the chronological development of the community itself. Evolution is about genetic changes in populations over generations, and a biome shift involves large-scale, climate-driven changes in regions, not the local progression of communities over time.