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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