Respuesta :
The Triassic, Jurassic, and Cretaceous periods, all of which were part of the Mesozoic era for dinosaurs. The Jurassic constitutes the middle period of the Mesozoic Era, also known as the Age of Reptiles. The Cretaceous is the third and final period of the Mesozoic Era.
Geologists have designated the Triassic, Jurassic, and Cretaceous periods to distinguish between different types of strata (chalk, limestone, etc.) deposited tens of millions of years ago. The dinosaurs survived the extinction of many huge terrestrial creatures, which allowed them to evolve into a wide range of shapes and multiply. Paleontologists link dinosaurs to the geologic era in which they lived since dinosaur remains are typically found embedded in rock, such as "the sauropods of the late Jurassic." In a nutshell, throughout this very long period of time, known as "mya" or "millions of years ago," dinosaurs, marine reptiles, fish, mammals, flying creatures like pterosaurs and birds, and a wide variety of plant life all evolved.
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