I'm afraid I don't have the answer to the precise study that proves it, but there are many images available of dissected or otherwise broken Spinosaurus teeth that reveal that they were hollow. fossil jaw fragments with broken teeth reveal that they were hollow. But the precise study, I'm searching for that myself.
It has indeed been proved that fox do have hollow bones. It has indeed been proved that fox do have hollow bones.
protons
very profitable
He proved that the world was round and larger than everyone thought it was.
very profitable
Coal and oil were two fossil fuels that proved essential to fuel the British Industrial Revolution.
It proved that curvatures of light around black holes existed.
It was previously thought that the Tyrannosaurus Rex was the king of the dinosaurs. However, recent evidence has proved this was wrong. The king of the dinosaurs was actually the Spinosaurus. Which was much larger, stronger, faster and far superior than the T-Rex.
This INDICATES that there was once a body of water or a river in this area and it has long since dried up and any organisms that dies there have been fossilized.
it proved that hominids lived in East Africa 5,000 years ago.
Yes, he proved that there was a westward route from china to India that changed everyone's maps
Niels Henrik Abel proved that there is no general solution to the quintic equation (5th. degree polynomial) with radicals.