Birds have bones which are

Options

A. elastic
B. solid and strong
C. pneumatic
D. non-elastic

Answer

**Step-by-Step Solution:**

1. **Identify the Phylum and Class of Birds**:
- Birds belong to the phylum Chordata and the class Aves. This classification is important as it helps us understand their biological characteristics.

2. **Types of Birds**:
- Birds can be classified into two categories: flying birds and flightless birds.
- Examples of flying birds include crows and sparrows, while flightless birds include kiwis, ostriches, and penguins.

3. **Bone Structure in Birds**:
- The bones of birds are known as pneumatic bones.
- Pneumatic bones are hollow, which is a key characteristic that aids in flight.

4. **Function of Hollow Bones**:
- The hollowness of these bones reduces the overall weight of the bird, making it easier for them to fly.
- This lightweight structure is essential for the mechanics of flight, allowing birds to be agile and efficient in the air.

5. **Comparison with Flightless Birds**:
- Flightless birds tend to have denser bones, which contribute to their inability to fly.
- Their heavier body weight and different body shape prevent them from taking flight.

6. **Conclusion**:
- Therefore, the correct answer to the question is that birds have bones which are pneumatic, meaning they are hollow and lightweight, facilitating flight.