Ecological succession usually focuses on which changes ?

Options

A. type of animals
B. type of decomposers
C. vegetation
D. humus content

Answer

**Step-by-Step Solution:**

1. **Definition of Ecological Succession**: Ecological succession is a gradual process that involves changes in the species structure of an ecological community over time. This includes the introduction of new species and the changes in the composition of existing species.

2. **Focus of Ecological Succession**: The focus of ecological succession is primarily on three main aspects:
- Changes in the types of **animals** present in the community.
- Changes in the types of **decomposers** that play a role in nutrient cycling.
- Changes in the types of **vegetation** or plant life that dominate the area.

3. **Types of Ecological Succession**:
- **Primary Succession**: This occurs in an area where no previous ecological community existed. For example, this can happen on bare rock after a volcanic eruption or in areas left barren after glacial retreat.
- **Secondary Succession**: This occurs in areas where a community has previously existed but was disturbed or destroyed by events such as fires, floods, or human activities. The community can recover and develop a new ecological structure.

4. **Conclusion**: Therefore, ecological succession focuses on changes in species composition, including animals, decomposers, and vegetation. The correct answer to the question is that it focuses on all these changes.

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