Type of blood circulation in amphibians is

Options

A. complete double
B. single
C. incomplete double
D. both (1) &(3)

Answer

### Step-by-Step Solution:

1. **Understanding Blood Circulation Types**:
- Blood circulation can be classified into single circulation and double circulation.
- In single circulation, blood passes through the heart only once during a complete circuit of the body.
- In double circulation, blood passes through the heart twice during a complete circuit of the body.

2. **Identifying Amphibian Circulation**:
- Amphibians are known to have a unique type of circulation due to their three-chambered heart.
- The heart consists of two atria and one ventricle.

3. **Chambers of the Amphibian Heart**:
- The left atrium receives oxygenated blood from the lungs.
- The right atrium receives deoxygenated blood from the body.
- Both types of blood mix in the single ventricle.

4. **Determining the Type of Double Circulation**:
- Since the oxygenated and deoxygenated blood mix in the ventricle, amphibians do not have complete separation of the two blood types.
- This leads to the conclusion that amphibians have an "incomplete double circulation."

5. **Final Conclusion**:
- Based on the structure of the amphibian heart and the mixing of blood, the correct answer to the question is "incomplete double circulation."

### Final Answer:
The type of blood circulation in amphibians is **incomplete double circulation**.

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