It can be reliably concluded from the results of the study cited above that A. Structures in dinosaurs that are apparently similar to structures in modern species of reptiles do not always serve the same functions that such structures do in modern species. B. Dinosaurs were so diverse that some species could have been cold-blooded and others warm-blooded. C. Several modern species of animals, some cold-blooded, some warm-blooded, have teeth with annual growth rings. D. Annual growth rings in warm-blooded animals are caused by extreme seasonal variations in temperatures, but this could not have been the case for dinosaurs, who lived in constant climates. E. The small number of fossilized remains of dinosaurs cannot be assumed to represent the most typical species of dinosaurs.