The serial changes in previously sterile or totally barren area is called...............

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the term that describes the serial changes occurring in an area that was previously sterile or barren.

2. **Defining Key Terms**:
- "Serial changes" refer to the gradual process of change in the structure and composition of a community over time.
- "Previously sterile or totally barren area" indicates a location that has no life or biological activity.

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