Answer: a. the turtle heart lacks a divided ventricle.
The heart is a main organ in the circulatory system. It pumps out the oxygenated blood so that it gets transported to all the body organs and cells. The turtle and crocodiles both are reptiles. The heart of the crocodile, is four chambered which possess two atria and two ventricles just like humans. But, in turtles, there are only three chambers. In turtles, the heart has two atria and a single ventricle.