- Ecological succession is the process of change in the species structure of an ecological community over time. It is a directional process, leading to a relatively stable state called the climax community. - The typical sequential stages of succession (sometimes presented with slightly varying terminology) are: 1. Nudation Creation of a bare area, devoid of any life. This can be caused by natural events like volcanic eruptions, floods, erosion, or human activities like deforestation. 2. Invasion (or Migration) Arrival of propagules (seeds, spores, etc.) of plants in the bare area. This involves three steps: migration (dispersal to the area), ecesis (establishment and initial growth), and aggregation (increase in number through reproduction). 3. Competition and Co-action As populations grow and species interact, competition for resources (light, water, nutrients, space) occurs. Co-actions (like facilitation or inhibition) also play a role in modifying the environment. 4. Reaction The organisms living in the area modify the environment (e.g., change soil composition, light availability, temperature, humidity). These changes make the habitat less suitable for the existing community but more suitable for new species. This stage drives the succession forward. 5. Stabilization (or Climax) Eventually, a relatively stable community develops that is in equilibrium with the environment and can reproduce itself. This is called the climax community. - The sequence presented in option C follows the logical progression: a bare area is formed (Nudation), species arrive and establish (Migration/Invasion), organisms interact and modify the environment (Reaction), leading towards a stable state (Stabilization/Climax).