arun6765 wrote:
Prompted by recent discoveries, paleontologists have starteda research on the fossils of feathered dinosaurs, a study that, igniting the debate over when and why dinosaurs developed plumage, and that makes many researchers believe that possibly all or most of them had feathers.
A. a research on the fossils of feathered dinosaurs, a study that, igniting the debate over when and why dinosaurs developed plumage, and that makes
B. a research on the fossils of feathered dinosaurs, a study that
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