Impact may have caused mass extinction that let hardy giants thrive.
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References
Olsen, P. E. et al. Ascent of dinosaurs linked to iridium anomaly at the Triassic-Jurassic boundary. Science 296, 1305 - 1307 (2002).
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University of Bristol, UK
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Pearson, H. Asteroid let dinosaurs rule. Nature (2002). https://doi.org/10.1038/news020513-11
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DOI: https://doi.org/10.1038/news020513-11