Premise: Some paleontologists have claimed that birds are descendants of a group of dinosaurs called dromeosaurs.
Premise: They appeal to the fossil record, which indicates that dromeosaurs have characteristics more similar to birds than do most dinosaurs.
Premise: But there is a fatal flaw in their argument; the earliest bird fossils that have been discovered date back tens of millions of years farther than the oldest known dromeosaur fossils.
Conclusion: Thus the paleontologists' claim is
...
Premise: They appeal to the fossil record, which indicates that dromeosaurs have characteristics more similar to birds than do most dinosaurs.
Premise: But there is a fatal flaw in their argument; the earliest bird fossils that have been discovered date back tens of millions of years farther than the oldest known dromeosaur fossils.
Conclusion: Thus the paleontologists' claim is
...
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