Dinosaurs are a group of reptiles [annex 1] of the Dinosauria branch, which first appeared in the Three Gorges around 243 – 233.23 million years ago, despite the exact origin and timelines in the process of progressing. Their chemistry is currently an active research topic. Since the extinction of the Three Gorges-Jura (201.3 million years ago), dinosaurs became the most dominant group of vertebrates throughout the Jurassic period until the end of the Cretaceous, when the event was great. the Cretaceous-Near-Cretaceous strain (66 million years ago) took place extinction of almost all dinosaur groups and three-quarters of the animals and plants on Earth, marking the end of the Great Mesozoic and the beginning of the Great Tan. Born. Fossil records show that the bird was a feathered dinosaur, evolving from an animal-like dinosaur to the late Jurassic. Therefore, birds are the only surviving descendant of dinosaurs. Dinosaurs can thus be divided into non-dinosaur dinosaurs – all other dinosaurs birds – and birds.
Dinosaurs are a diverse group from taxonomic, morphological to ecological. Birds, with more than 10,000 living species, are the most diverse group of vertebrates other than Sea bass. According to fossil evidence, paleontologists have identified 500 genera and more than 1,000 species of ostriches. Dinosaurs are present on every continent, through existing species (birds) as well as remaining fossils. During the first half of the twentieth century, before birds were considered dinosaurs, most scientific communities believed that dinosaurs were slow and heat-changing animals. However, most studies in the 1970s have shown that dinosaurs are active animals with high metabolism and good adaptability for social relations. Some eat plants, others eat meat. There is evidence that all dinosaurs lay eggs, and building nests was a secondary feature of all dinosaurs, both birds and birds.
