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The researchers were surprised to find that the early dinosaur bones were more similar to those of alligators and deer than to those of the dinosaurs' later descendants."Prior to this study, it looked unlikely to me that invasive air sacs would have evolved three times independently" in separate dinosaur lineages, Aureliano says-but the new results suggest that scenario.
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Instead the study most likely indicates that air sacs invaded the bone multiple times independently, as the reptiles became larger and more diverse.
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