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Intro. Dinosaurs existed around 231 to 243 million years ago, during the Mesozoic era, which is divided into three periods: Triassic, Jurassic, and Cretaceous.
Periods of existence:
Triassic : The first dinosaurs appeared about 230-240 million years ago. They were small bipedal carnivores that evolved from archosaurs.
Jurassic : During this period, dinosaurs grew in size and diversity, becoming the dominant species on Earth. Examples include Diplodocus and Stegosaurus.
Cretaceous : In this period, dinosaurs reached their greatest diversity and colonized every habitat in the world. Examples include Tyrannosaurus Rex, Triceratops, and Velociraptor.
Number of species:
Although the exact number of dinosaur species that existed is not known, it is estimated that there are more than 1,000 known species, but it is thought that many more could have existed. Some of the most well-known genera are ¹²³:
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Dinosaurs the Earth before time
@Black
Dinosaurs the Earth before time
Replying...
Intro. Dinosaurs existed around 231 to 243 million years ago, during the Mesozoic era, which is divided into three periods: Triassic, Jurassic, and Cretaceous.
Periods of existence:
Triassic : The first dinosaurs appeared about 230-240 million years ago. They were small bipedal carnivores that evolved from archosaurs.
Jurassic : During this period, dinosaurs grew in size and diversity, becoming the dominant species on Earth. Examples include Diplodocus and Stegosaurus.
Cretaceous : In this period, dinosaurs reached their greatest diversity and colonized every habitat in the world. Examples include Tyrannosaurus Rex, Triceratops, and Velociraptor.
Number of species:
Although the exact number of dinosaur species that existed is not known, it is estimated that there are more than 1,000 known species, but it is thought that many more could have existed. Some of the most well-known genera are ¹²³:
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Dinosaurs the Earth before time
@Black
Dinosaurs the Earth before time