Question

comparative account on vertebrate heart​

Answer 1

Explanation:

Fish have a simple two chambered heart which is, in essense, just a thickening of a section of the circulatory system, and the blood flows in a single circuit from heart to gills to body and back to the heart.

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Answer 2

Answer:

Fish have a simple two chambered heart which is, in essense, just a thickening of a section of the circulatory system, and the blood flows in a single circuit from heart to gills to body and back to the heart. ...