Which one of the following animals has two separate circulatory pathways

Options

A. Frog
B. Lizard
C. Whale
D. Shark

Answer

To determine which animal has two separate circulatory pathways, we can analyze the options provided: frog, lizard, whale, and shark.

### Step-by-Step Solution:

1. **Understand Circulatory Pathways**:
- Animals can have either a single circulatory pathway or a double circulatory pathway. In a double circulatory system, there are two distinct pathways: one for oxygenation of blood (pulmonary circulation) and another for distributing oxygenated blood to the body (systemic circulation).

2. **Analyze Each Option**:
- **Frog**: Frogs have a three-chambered heart and a single circulatory pathway that mixes oxygenated and deoxygenated blood. Thus, they do not have two separate circulatory pathways.
- **Lizard**: Lizards also have a three-chambered heart, which means they have some mixing of blood, similar to frogs. They do not have two completely separate circulatory pathways.
- **Whale**: Whales are mammals and possess a four-chambered heart. They have two separate circulatory pathways: pulmonary circulation (blood flow between the heart and lungs) and systemic circulation (blood flow from the heart to the rest of the body).
- **Shark**: Sharks have a two-chambered heart and a single circulatory pathway, which means they do not have separate pathways for oxygenation and distribution.

3. **Conclusion**:
- After analyzing all the options, it is clear that the whale is the only animal listed that has two separate circulatory pathways: pulmonary and systemic circulation.

### Final Answer:
The animal that has two separate circulatory pathways is **C) Whale**.

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