The scientists determined that changes in sauropod body size do not track changes in atmospheric oxygen content, carbon dioxide content or changes in temperature, all of which had been hypothesized as driving sauropod body size. Instead it appears that some traits sauropods inherited from their ancestors, such as swallowing large amounts of food without chewing, allowed the beginnings of increased body size, which was further allowed by the development of evolutionary novelties along the way (i.e. a bird-like breathing system that would have allowed oxygen to be supplied to their bodies more efficiently).
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