Identify pair which has three chamber heart.

Options

A. Mammals and Amphibians
B. Amphibians and Reptiles
C. Amphibians and Fishes
D. Fishes and Reptiles

Explanation

To solve the question, "Identify the pair which has a three-chamber heart," we will analyze the heart structure of different animal groups mentioned in the options.

### Step-by-Step Solution:

1. **Understand the Heart Structure of Amphibians**:
- Amphibians, such as frogs and salamanders, have a three-chambered heart. This heart consists of two atria and one ventricle. The two atria receive blood, one from the body (deoxygenated) and one from the lungs (oxygenated), and both atria empty into a single ventricle.

2. **Examine the Heart Structure of Mammals**:
- Mammals have a four-chambered heart, which includes two atria and two ventricles. This structure allows for complete separation of oxygenated and deoxygenated blood, making mammals unsuitable for the three-chamber heart category.

3. **Look at the Heart Structure of Reptiles**:
- Most reptiles, like snakes and lizards, also have a three-chambered heart, consisting of two atria and one ventricle. However, crocodiles are an exception as they possess a four-chambered heart.

4. **Analyze the Heart Structure of Fishes**:
- Fishes have a two-chambered heart, which consists of one atrium and one ventricle. Therefore, they do not fit into the three-chamber heart category.

5. **Evaluate the Options**:
- **Mammal and Amphibian**: Incorrect (Mammals have four chambers).
- **Amphibian and Reptiles**: Correct (Both have three chambers).
- **Amphibian and Fishes**: Incorrect (Fishes have two chambers).
- **Fishes and Reptiles**: Incorrect (Fishes have two chambers, and only some reptiles have three).

### Conclusion:
The correct pair that has a three-chamber heart is **Amphibian and Reptiles**.

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