What does this graph tell you about the relationship between body mass and metabolic rate in general? How does metabolic rate differ between endotherms, mesotherms, and ectotherms of the same body size? Justify your answer using evidence from the graph. Based on this data, are dinosaurs closest to endotherms, ectotherms, or mesotherms? Provide evidence to support your claim. Why is it necessary to show metabolic rate in relation to body size and not just metabolic rate? Why was it necessary for researchers to control for external temperature when selecting living organisms to compare with dinosaurs? What does the thermoregulatory strategy of dinosaurs tell us about the way they lived?