Cells are autonomous because

Options

A. They synthesise components of living protoplasm from nonliving materials
B. They are able to grow and divide
C. Each cells has its own life span
D. All the above

Answer

To answer the question "Cells are autonomous because," we need to analyze the provided options and understand the concept of cellular autonomy.

### Step-by-Step Solution:

1. **Understanding Autonomy in Cells**:
- Cells are considered autonomous because they can perform all necessary functions for their survival independently. This includes synthesizing their own components, growing, dividing, and having a lifespan.

2. **Analyzing Option A**:
- **They synthesize components of living protoplasm from non-living material**:
- This statement is true. Cells can take in non-living materials (like nutrients) and convert them into living protoplasm, which is essential for their structure and function.

3. **Analyzing Option B**:
- **They are able to grow and divide**:
- This statement is also true. Cells have the ability to grow in size and divide to form new cells, which is a fundamental aspect of life and contributes to the maintenance and reproduction of organisms.

4. **Analyzing Option C**:
- **Each cell has its own lifespan**:
- This statement is true as well. Cells undergo a life cycle, and each cell has a specific lifespan after which it may die or be replaced by new cells.

5. **Conclusion**:
- Since all the statements (A, B, and C) are true, the correct answer to the question is **D. all of the above**. This indicates that cells are autonomous due to their ability to synthesize components from non-living materials, grow and divide, and have their own lifespan.

### Final Answer:
**D. all of the above**

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