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|Dinosaurs are animals that evolved into many sizes and shapes. Dinosaurs were and are quite diverse, and often one person will think of|
|an animal likea long-necked sauropod, while another person will think of a large, fierce meat-eater like Tyrannosaurus rex. It should |
|be clear then that the term "dinosaurs", or the scientific version"Dinosauria", is describing a diverse group of animals with widely |
|different modes of living. The term was invented by Sir Richard Owen in 1842 to describe these "fearfully great reptiles",specifically|
|Megalosaurus, Iguanodon, and Hylaeosaurus, the only three dinosaurs known at the time. The creatures that we normally think of as |
|dinosaurs lived from late in the Triassicperiod (about 225 million years ago) until the end of the Mesozoic era (about 65 million |
|years ago); but actually they live on today as the birds.|
|Different dinosaurs lived at different times. Despite the portrayals in movies like Fantasia and Jurassic Park, no Stegosaurus ever saw|
|a Tyrannosaurus,because Tyrannosaurus wasn't alive for another 80 or so million years. Ditto for Apatosaurus (a.k.a. "Brontosaurus"). |

|1. When is the term "Dinosauria" used?|_________________________________ |
|2. Which dinosaurs were the first to be discovered by |_________________________________|
|humans? | |
|3. Which livingorganism is a close relative of the |_________________________________ |
|prehistoric dinosaur? |...
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