Whale bone is is related to

Options

A. Sternum
B. Pectoral girdle
C. Upper jaw
D. Lower jaw .

Answer

### Step-by-Step Solution:

1. **Understanding Whale Anatomy**: Begin by recognizing that whales are mammals and have unique anatomical features. The bones in their bodies serve specific functions related to their lifestyle and feeding habits.

2. **Identifying Whale Bones**: Among the various bones in a whale's body, the bones in the upper jaw are particularly significant. In baleen whales, these bones are modified into structures known as baleen plates.

3. **Function of Baleen Plates**: The baleen plates in the upper jaw are used for filtering food from the water. Whales like the blue whale and humpback whale use these plates to filter plankton and small fish from the ocean.

4. **Examining the Options**: The question provides four options: sternum, pectoral girdle, upper jaw, and lower jaw.
- **Sternum**: This is the breastbone, which is not directly related to the feeding mechanism of whales.
- **Pectoral Girdle**: This refers to the bones that support the forelimbs, not directly related to the jaw.
- **Upper Jaw**: This is where the baleen plates are located, making it the correct answer.
- **Lower Jaw**: While important, it does not have the baleen plates.

5. **Conclusion**: Based on the anatomical function of the whale bones and their specific adaptations for feeding, the correct answer is that whale bone is related to the **upper jaw**.

### Final Answer:
Whale bone is related to the **upper jaw**.

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