It was a mix between both.
Unlike the modern reptiles we know and love, most dinosaurs were endothermic (warm-blooded). So, although T-rexes were cold-blooded killers, yes, they were warm-blooded.
T-Rexes.
T-Rexes.
Yes, all dinosaurs are warm blooded.
Recent research suggests T-Rex were actually warm blooded like birds and mammals.
No sh*t, Polar bears are warm blooded
Yes, it was a placental mammal, but is now extinct.
Dinosaurs were like birds. T-rex probably maintained a temperature in the range of 40 C or 100 F. They probably did not have the precise control mechanism of mammals so the temperature probably fluctuated over a wider range.
Apatosaurus was a dinosaur, and relatively recent research suggests that dinosaurs were in fact warm blooded. Sauropods such as Apatosaurus appear to also have been warm blooded.
my mum
north America and Asia
a venamous monkey that eats t-rexes