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Choose the correct option.

Correct answer: D. While dinosaurs were ancestrally bipedal, many extinct groups included quadrupedal species.

  • A. While dinosaurs were ancestrally bipedal, then many extinct groups included quadrupedal species.
  • B. When dinosaurs were ancestrally bipedal, so many extinct groups included quadrupedal species.
  • C. While dinosaurs were ancestrally bipedal; many extinct groups included quadrupedal species.
  • D. While dinosaurs were ancestrally bipedal, many extinct groups included quadrupedal species.

Explanation

This sentence is correct. "While" correctly indicates a contrast between dinosaurs being bipedal and the existence of quadrupedal species among extinct groups. The comma is properly placed.

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