Yes, of course the mosasaur was smart
Mosasaur fossils are fossils of the prehistoric sea monster called Mosasaurus.
pliosaur
mosasaur was a strict carnivor. there were accually no plant eating dinosaurs that lived in water.
Trex
Yes
Capitalize trex when you are using it as a proper noun, such as a specific thing or trademark.
Yes
trex
is trex decking safe for dogs?
Trex was 40ft long, but it is not the biggest meat eating dionsaur
No, TRex was Trianosaurus Rex, an extinct (fossil) dinosaur.