What is common of Whale, Seal and Shark?

Options

A. Homolothermy
B. Seasonal migration
C. Thick subcutaneous fat
D. Convergent evolution.

Answer

To answer the question "What is common of Whale, Seal, and Shark?", we will analyze the options provided: Homoiothermy, seasonal migration, thick subcutaneous fat, and convergent evolution.

### Step-by-Step Solution:

1. **Understanding the Organisms**:
- Whales are mammals that live in water.
- Seals are also mammals that are adapted to marine life.
- Sharks are fish that inhabit the ocean.

2. **Identifying the Characteristics**:
- **Homoiothermy** (or endothermy) refers to the ability to maintain a constant body temperature regardless of the environment. Whales and seals are homoiothermic, but sharks are not.
- **Seasonal Migration** is a behavior observed in some species of whales and seals, but it does not apply to sharks in the same way.
- **Thick Subcutaneous Fat** is a characteristic of whales and seals, which helps them insulate against cold water. Sharks do not have this feature.
- **Convergent Evolution** is the process where unrelated organisms evolve similar traits due to adapting to similar environments.

3. **Analyzing Convergent Evolution**:
- Whales (mammals), seals (mammals), and sharks (fish) have all evolved streamlined bodies and fins for swimming in water. This is an example of convergent evolution, where different species develop similar adaptations to thrive in similar environments.

4. **Conclusion**:
- The commonality among whales, seals, and sharks is **convergent evolution**. They have developed similar adaptations (like body shape and swimming mechanisms) despite being from different evolutionary lineages.

### Final Answer:
The commonality of whales, seals, and sharks is **convergent evolution**.

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