Sentence A tells us that birds are modern descendants of dinosaurs and hence they are likely to have once had teeth. Sentence C also talks of teeth, stating that “this fact” became known in 1861 with the discovery of Archaeopteryx, which had teeth. The fact referred to here is the one stated in sentence A, that birds once had teeth. So C follows A. We now need to find the third sentence that fits in with C and A. Sentence B says that non-avian dinosaurs sprouted feathers 100 million years ago. Sentence D declares that researchers have discovered that avian edentulism, or loss of teeth, occurred in one common bird ancestor 100 million years ago. It is clear that CAD makes a cogent paragraph. B is the sentence to be eliminated. Correct Answer: Choice (b)
All features of the online course, including the classes, discussion board, quizes and more, on a mobile platform.
Download videos onto your mobile so you can learn on the fly, even when the network gets choppy!