Dinosaurs
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.
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.
The Mesozoic era.
The type of animal that lived only during the Mesozoic Era (Age of Reptiles) were the dinosaurs. They evolved during the late Triassic and the Jurassic periods, and were the largest land creatures during the Cretaceous period of the era.
Angiosperms They produced seeds that are protected they are the most diverse and abundant land plants today. Present day angiosperms that evolved during the mesozic era include magnolia and oak trees.
Dinosaurs flourished during the Mesozoic Era due to favorable environmental conditions, abundant food sources, and the absence of large land predators. Their adaptations, such as size, reproduction strategies, and specialized features, also contributed to their success.
Precambrian
The dominant land animal life during the Mesozoic was reptiles and dinosaurs.However, it is important to note that dominant does not mean the most biodiverse, common, or consisting of the greatest biomass. It simply means that they were the most common large vertebrates. Insects, for example, have always beaten reptiles in biodiversity and I believe biomass, too.
The first land vertebrates appeared in the: Devonian
No, that is not the case. There were many land habitats during the Mesozoic, and dinosaurs lived in all of them. They first evolved in Pangaea during the Triassic, when almost all land was a desert. After that, however, they evolved into new forms and adapted to new habitats that developed, including forests, swamps, floodplains, and plains covered in ferns (there were no grasslands during the Mesozoic).
The name "Pangea" means "all land" in Greek. It was the supercontinent that existed during the late Paleozoic and early Mesozoic eras.
One is that the first reptiles (not dinosaurs!) appeared. The land during this peiod was swamp-forests.