A. Because of its hollow spine
B. Because of the shape and movement of the teeth
C. Because of its unusual bony and muscular development
D. Because of the size of the skull
B
Dẫn chứng: It was named for its hollow spine and was known to have been powerful carnivores because of its many sharp teeth and a special joint in the skull that allowed the ferocious teeth to move in coordination with the lower jaw.
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