Final answer:
Birds evolved from theropod dinosaurs of the Saurischia group, supported by anatomical similarities.
Explanation:
Birds evolved from theropod dinosaurs, specifically the bipedal predators within the group Saurischia. This course of evolution is supported by similarities in the hip and wrist bone structure between theropod fossils and birds, as well as the presence of the wishbone.
Learn more about Evolution of Birds here:
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