With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: During the Cretaceous, the present North American continent was isolated from the other continents. In the Jurassic, the North Atlantic already opened, leaving a proto-ocean between Europe and North America. From north to south across the continent, the Western Interior Seaway started forming. This inland sea separated the elevated areas of Laramidia in the west and Appalachia in the east. Three dinosaur clades (troodontids, therizinosaurids and oviraptorosaurs) found throughout Appalachia from the Coniacian through the Maastrichtian are absent from Larmidia.
text_B: Would a biologist say that traits of troodontids, therizinosaurids, and oviraptorosaurs had evolved independently in separate populations, given the fact that these dinosaurs could be found on either side of a natural barrier?
NO.