Four chambered heart is present in

Options

A. turtles
B. lizards
C. snakes
D. crocodiles

Answer

To determine which of the given options has a four-chambered heart, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of a Four-Chambered Heart**:
- A four-chambered heart consists of two atria (upper chambers) and two ventricles (lower chambers). This structure allows for efficient separation of oxygenated and deoxygenated blood.

2. **Identify the Organisms in the Options**:
- The options provided are turtle, lizard, snakes, and crocodile. All these organisms are classified as reptiles.

3. **Know the General Heart Structure in Reptiles**:
- Most reptiles have a three-chambered heart, which consists of two atria and one ventricle. This is the typical heart structure for reptiles.

4. **Identify the Exception Among Reptiles**:
- While most reptiles have a three-chambered heart, there is an exception. Crocodiles are unique among reptiles because they possess a four-chambered heart.

5. **Conclusion**:
- Based on the information, the only organism from the options that has a four-chambered heart is the crocodile.

### Final Answer:
The four-chambered heart is present in **crocodiles**.

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