Decomposition is largely

Options

A. A non oxygenic process
B. An oxygen requiring process
C. A rapid process
D. Both (1) and (3)

Answer

### Step-by-Step Solution:

1. **Understanding Decomposition**:
- Decomposition is the process by which complex organic substances are broken down into simpler forms. This is essential for nutrient cycling in ecosystems.

2. **Role of Oxygen**:
- Decomposition typically requires oxygen. It is primarily an aerobic process, meaning that it occurs in the presence of oxygen. Without oxygen, the decomposition process cannot be completed effectively.

3. **Speed of Decomposition**:
- The rate of decomposition can be rapid, but it depends on the complexity of the material being decomposed. Simpler substances decompose more quickly than complex ones.

4. **Complexity of Substances**:
- If the organic material is highly complex (e.g., polymers like chitin), it will take longer to decompose. Thus, while decomposition can be rapid, the time taken increases with the complexity of the material.

5. **Conclusion**:
- Based on the above points, we can conclude that decomposition is largely an oxygen-requiring process. While it can be rapid, this speed is contingent on the complexity of the material being decomposed. Therefore, the correct answer to the question is that decomposition is largely an oxygen-requiring process.

### Final Answer:
- Decomposition is largely an oxygen-requiring process.