The final stage of ecological succession in an ecosystem is called:

The correct answer is Climax Community. Ecological succession is the gradual change in an ecosystem over time. The final, stable stage of this succession is called the climax community. At this stage, the ecosystem is relatively balanced and has reached its maximum diversity and stability, with minimal further change. Among the options:

• Seral Stage: An intermediate stage in succession, not the final one.
• Pioneer Community: The very first stage of succession.
• Secondary Succession: The process of succession after a disturbance, not the final stage.
• Climax Community: Correct; this is the final, stable stage.

Hence, the correct answer is "Climax Community".