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 which of the following groups of vertebrates is…Which of the following heart structures is best…In the diagram, A unique characteristic that…Which of the following adapts the aorta to the high…Which blood cell are involved in the immune response…