Sentence Elimination - Loss of Teeth in Birds

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Sentence Elimination- Loss of Teeth in Birds

  1. Since birds are the modern descendants of dinosaurs, they are likely to have once had teeth instead of beaks.
  2. However, 100 million years ago a diverse range of non-avian dinosaurs spouted all manner of plumage, and like modern birds, doubtless made a great deal of use of them, even if they could not fly.
  3. This fact became known way back in 1861 when paleontologists discovered a bird fossil, about 150 million years old, now classified as Archaeopteryx, which had teeth.
  4. Researchers have now published details of how avian edentulism occurred in one common bird ancestor more than 100 million years ago.


  • Correct Answer
    Choice B

Detailed Solution

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)

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