Dinosaurs and many other species were extinct about ________ years ago.
Correct answer: B. 66 million
- A. 55 million
- B. 66 million
- C. 75 million
- D. 85 million
Explanation
The non-avian dinosaurs disappeared in the end-Cretaceous mass extinction about 66 million years ago. The event is commonly linked to the Chicxulub asteroid impact along with major environmental changes.
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