Atomspheric layer protective to living beings from harmful rays is

Options

A. Mesosphere
B. Ozonosphere
C. Thermosphere
D. Both B and C.

Answer

### Step-by-Step Solution:

1. **Identify the Question**: The question asks which atmospheric layer protects living beings from harmful rays.

2. **Understand the Options**: The options provided are:
- A) Mesosphere
- B) Ozonosphere
- C) Thermosphere
- D) Both B and C

3. **Analyze Each Layer**:
- **Mesosphere**: This layer is located above the stratosphere and does not have a significant role in filtering harmful rays.
- **Ozonosphere**: Also known as the ozone layer, it is situated in the stratosphere and is crucial for protecting the Earth from harmful ultraviolet (UV) radiation.
- **Thermosphere**: This layer is above the mesosphere and is characterized by high temperatures but does not provide protection from UV rays.

4. **Determine the Correct Answer**: The ozone layer (ozonosphere) is specifically known for its protective function against harmful UV rays. Therefore, the correct answer is **B) Ozonosphere**.

5. **Conclusion**: The atmospheric layer that protects living beings from harmful rays is the ozonosphere.