Venous heart is found in

Options

A. Amphibians
B. Reptiles
C. Birds
D. Fishes

Answer

### Step-by-Step Solution

1. **Understanding Venous Heart**: The term "venous heart" refers to a type of heart structure that is characterized by having a limited number of chambers. It typically consists of one auricle and one ventricle, making it a two-chambered heart.

2. **Analyzing the Options**: The question provides four options: amphibians, reptiles, birds, and fishes. We need to determine which of these groups possesses a venous heart.

3. **Examining Each Option**:
- **Amphibians**: Amphibians have a three-chambered heart, consisting of two atria and one ventricle. Therefore, they do not have a venous heart.
- **Reptiles**: Most reptiles also possess a three-chambered heart, with the exception of crocodiles, which have a four-chambered heart. Thus, reptiles do not have a venous heart.
- **Birds**: Birds have a four-chambered heart, which is more complex and efficient for their high metabolic needs. Therefore, birds do not have a venous heart.
- **Fishes**: Fishes possess a two-chambered heart, which consists of one atrium and one ventricle. This structure aligns with the definition of a venous heart.

4. **Conclusion**: Based on the analysis, the correct answer to the question "Venous heart is found in" is **fishes**.