The mammals.
No. The 1st vertebrates appeared in the fossil record about 525 million years ago during the Cambrian Period. This was in the Paleozoic Era.
Dinosaurs
MAMMALS
No, the first vertebrates evolved long before the Mesozoic. The first vertebrates, small jawless fish, evolved around 520 million years ago. Land animals had even evolved long before the Mesozoic Era.
Reptiles were the main vertebrates during the Mesozoic. There were dinosaurs on land and pterosaurs in the sky. There were also marine reptiles like plesiosaurs and mosasaurs.
pigeon
Pterosaurs
Pterosaurs
The dinosaurs lived in the Mesozoic Era, which includes the Triassic, Jurassic, and Cretaceous periods. The first dinosaurs appeared in the late Triassic and went extinct at the end of the Cretaceous.
The first flowering plants appeared in the Mesozoic era, but I don't know what period.
No. Cave men did not live during the mesozoic era.
Vertebrates first appeared during the Paleozoic era.