While some scientists argue the asteroid killed off the dinosaurs, new evidence from fossil eggs and eggshells says dinosaur diversity was declining well before it hit.
support the opposite idea, stating that decreasing diversity preceded the dinosaurs’ ultimate demise.
The issue with this scholarship is twofold. In addition to contradicting one another, these two types of studies also concentrate mostly on fossils found in North America, making their conclusions difficult to translate into worldwide trends. Thus, a team of researchers aimed to determine whether dinosaurs' diversity increased or decreased on worldwide scale in advance of their extinction. The team from the Chinese Academy of Sciences assessed a plethora of fossilized eggs and eggshells from China. They found that dinosaurs did, in fact, dwindle, supporting the theory that several additional factors — including increased volcanic activity — exacerbated the effects of the eventual asteroid.
This timeline eventually exposed a strong decline in the number of species in the years prior to the extinction. In fact, every egg and eggshell found at the site came from one of only three different dinosaur species, including the toothless
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