(A) Dinosaurs,often referred to as 'terrible lizards',were dominant terrestrial vertebrates that lived on Earth approximately $200$ million years ago.

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(A) Dinosaurs,often referred to as 'terrible lizards',were dominant terrestrial vertebrates that lived on Earth approximately $200$ million years ago.They flourished and were most abundant during the Jurassic period of the Mesozoic era,long before the appearance of the first humans.