Which of the following have three chambered heart?

Options

A. Amphibian
B. Fish
C. Mammal
D. Bird

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which organisms possess a three-chambered heart.

2. **Identifying the Options**: The options provided are:
- Option 1: Amphibians
- Option 2: Fish
- Option 3: Mammals
- Option 4: Birds

3. **Analyzing Each Option**:
- **Amphibians**: Amphibians, such as frogs and toads, have a three-chambered heart, which consists of two atria and one ventricle. This structure allows for some mixing of oxygenated and deoxygenated blood.
- **Fish**: Fish have a two-chambered heart, consisting of one atrium and one ventricle. This type of heart does not meet the criteria for a three-chambered heart.
- **Mammals**: Mammals have a four-chambered heart, which includes two atria and two ventricles, preventing any mixing of oxygenated and deoxygenated blood.
- **Birds**: Similar to mammals, birds also have a four-chambered heart, ensuring efficient separation of blood.

4. **Conclusion**: Based on the analysis, the only group that has a three-chambered heart is amphibians. Therefore, the correct answer is **Option 1: Amphibians**.

5. **Additional Information**: It is also noted that some reptiles, like crocodiles, have a heart structure that can be considered three-chambered under certain conditions, but amphibians are the primary group known for having a three-chambered heart.