Which of the following vertebrates has the most simple structured heart? by Sunday | Sep 9 | Biology JAMB | 0 comments A. reptile B. fish C. mammal D. amphibian Correct Answer: Option B – fish Users Also Read These:In the diagram, A unique characteristic that…Which of the following blood vessels carries…Which of the following describes the sequence of…Which of the following heart structures is best…Which of the following adapts the aorta to the high…