Heart is three - chambered in

Options

A. Ichthyophis
B. Catla
C. Petromyzon
D. Aptenodytes

Answer

To answer the question "Heart is three-chambered in," we will analyze the options provided and identify which organism has a three-chambered heart.

### Step-by-Step Solution:

1. **Identify the Options**: The options given are:
- Ectiophys
- Catala
- Petromyzen
- Aptendrocytes

2. **Analyze Each Organism**:
- **Ectiophys**: This organism is classified as an amphibian. Amphibians typically have a three-chambered heart, which consists of two atria and one ventricle.
- **Catala**: This organism is a type of fish. Fish generally have a two-chambered heart, which includes one atrium and one ventricle.
- **Petromyzen**: Also known as sea lamprey, this organism is another aquatic animal that possesses a two-chambered heart.
- **Aptendrocytes**: This refers to a type of penguin, specifically a large king penguin. Penguins, being birds, have a four-chambered heart, which consists of two atria and two ventricles.

3. **Conclusion**: From the analysis, the only organism that has a three-chambered heart is **Ectiophys**. Therefore, the correct answer to the question is:
- **Ectiophys**

### Final Answer:
The heart is three-chambered in **Ectiophys**.