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Heart is two chambered in...

Heart is two chambered in

A

Fishes

B

Amphibians

C

Reptiles

D

Birds

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### Step-by-Step Solution: 1. **Understanding Heart Structure in Vertebrates**: - The heart structure varies among different classes of vertebrates. The heart can have two, three, or four chambers depending on the type of organism. 2. **Analyzing the Options**: - **Fishes**: Fishes are known to have a two-chambered heart, consisting of one atrium (auricle) and one ventricle. - **Amphibians**: Amphibians possess a three-chambered heart, which includes two atria and one ventricle. - **Reptiles**: Reptiles typically have an incomplete four-chambered heart, with two atria and a partially divided ventricle. - **Birds**: Birds have a fully developed four-chambered heart, consisting of two atria and two ventricles. 3. **Identifying the Correct Answer**: - Based on the analysis, the only group that has a two-chambered heart is fishes. 4. **Conclusion**: - Therefore, the correct answer to the question "Heart is two-chambered in" is **fishes**.
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