Researcher: Dinosaurs lack turbinates -- nasal cavity bone structures in warm-blooded species that minimize water loss during breathing  According to some paleobiologists, this implies that all dinosaurs were cold-blooded  These paleobiologists must be mistaken, however, for fossil records show that some dinosaur species lived in Australia and Alaska, where temperatures drop below freezing
Only warm-blooded animals could survive such temperatures
It is a premise offered in support of the argument's main conclusion.