Recently, a group of scientists conducted an experiment in which rats were exposed to radiation emitted by cell phones. The purpose of the experiment was to determine if exposure to cell phone radiation might cause the rats to develop a disease, including cancer. Evolutionary Relationships among Groups of Mammals What is the BEST reason for not drawing conclusions regarding human exposure to cell phone radiation from this research? Research using rats cannot be used to draw conclusions about diseases in other organisms. Research on rats should only be compared to other organisms on the same branch of the diagram. Humans and rats are not as similar structurally and functionally as humans are to some other organisms on the diagram. Only research results on organisms that are similar structurally and functionally to humans should be used to draw conclusions about humans.