Final answer:
Modern birds, such as Paleognathae, Galloanserae, and Neoaves, are the living descendants of ancient dinosaurs.
Explanation:
Modern birds are descendants of avian dinosaurs, specifically theropod dinosaurs. Birds belong to a group called archosaurs and have evolved from these ancient creatures over millions of years. They are the only living descendants of the major clade of dinosaurs that roamed the Earth during the Mesozoic Era.
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