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https://scitechdaily.com/paleontologists-stunning-conclusion-2-5-billion-t-rexes-roamed-north-america-over-the-cretaceous-period/amp/
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https://scitechdaily.com/paleontologists-stunning-conclusion-2-5-billion-t-rexes-roamed-north-america-over-the-cretaceous-period/amp/
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