1 Select the correct text in the passage.
Which two words are domain-specific words?
In the 1860s, a fossil of an avian or flying dinosaur known as Archaeopteryx was found. Scientists identified it as a combination of bird and reptile. This discovery led to the theory that birds have evolved from carnivorous avian dinosaurs. Archaeopteryx lived in the southern region of Germany during the Late Jurassic period when Germany had a tropical climate.
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For 130 years, dinosaurs have been divided into two distinct clades—Ornithischia and Saurischia. Here we present a hypothesis for the phylogenetic relationships of the major dinosaurian groups that challenges the current consensus concerning early dinosaur evolution and highlights problematic aspects of current cladistic definitions. Our study has found a sister-group relationship between Ornithischia and Theropoda (united in the new clade Ornithoscelida), with Sauropodomorpha and Herrerasauridae (as the redefined Saurischia) forming its monophyletic outgroup. This new tree topology requires redefinition and rediagnosis of Dinosauria and the subsidiary dinosaurian clades. In addition, it forces re-evaluations of early dinosaur cladogenesis and character evolution, suggests that hypercarnivory was acquired independently in herrerasaurids and theropods, and offers an explanation for many of the anatomical features previously regarded as notable convergences between theropods and early ornithischians.

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