The heart of a fish is:

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(B) The heart of a fish is described as a $2$-chambered heart,consisting of one atrium and one ventricle. It is also known as a venous heart because i

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Venous heart

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(B) The heart of a fish is described as a $2$-chambered heart,consisting of one atrium and one ventricle. It is also known as a venous heart because it only pumps deoxygenated blood to the gills for oxygenation. Therefore,both options $B$ and $C$ are technically correct descriptions of a fish heart. However,in the context of standard biological classification,it is primarily defined as a $2$-chambered venous heart. Given the options provided,if a single choice must be made,$B$ and $C$ are both accurate,but often 'Venous heart' is the specific physiological term used.

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