The establishment and development of an ecosystem in an area that was previously uninhabited is called what?

• A. Primary Succession
• B. Secondary Succession
• C. Pioneer Species
• D. Aerobic

Answer: (A)

Primary succession is the process by which a brand-new ecosystem forms in a place that has no soil or life to begin with. It starts on bare rock or barren land, like after a lava flow or a retreating glacier. Hardy pioneer species such as lichens and mosses colonize first, slowly breaking down rock and building up soil. As soil develops, more plants can take root, and the community becomes increasingly complex—from grasses to shrubs to trees—until a mature ecosystem is established. This differs from secondary succession, which happens after a disturbance when soil remains and recovery occurs more quickly. Pioneer species are the initial colonizers, not the process itself, and the term describing the establishment of life in a barren area is primary succession.