This dinosaur printed dog harness is designed to help you understand the origin of dinosaurs in depth. Dinosaurs originated from microorganisms that lived in the ocean billions of years ago. Gradually, microorganisms evolved into fish. As the number of organisms in the ocean increased, fish evolved into amphibians that walked on land, and then evolved into reptiles. Dinosaurs are known as the kings of land. They lived in the Mesozoic Era from about 225 million years ago to 65 million years ago, which lasted about 160 million years. During this long period of time, plants on land also changed with the changes of the times. Dinosaur Period The Triassic Period (about 248 million to 208 million years ago) was the first period of the Mesozoic Era. At that time, all the land formed a supercontinent called Pangaea, the northern half of which was called Laurasia and the southern half was Gondwana. ___ At that time, the climate in all places was warm or hot. There was no ice covering the poles, and deserts expanded inland. Flowering plants had not yet evolved. Jurassic - (about 210 million to 140 million years ago) is the second period of the Mesozoic Era. Conifers and ginkgo trees flourished in Asia. Pangaea continued to separate. Cretaceous - (about 140 million to 65 million years ago) is the third period of the Mesozoic Era. Although dinosaurs continued to prosper, they all became extinct at the end of this era. Pangaea, which began to split in the Triassic Period, quickly formed the Atlantic Ocean in the Cretaceous Period. From 65 million years ago to the present, this pet collar shows how dinosaurs came into being.

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