A. It was rather uniform
B. It guaranteed their survival
C. It made them the largest creatures ever on earth
D. It varied quite greatly
Đáp án là D. Dựa vào ý: “The biggest ones weighed more than ten times as much as a mature elephant and nearly equalcd the size of most modem—day whales. ….Not all dinosaurs were giants, however, some were actually no larger than a chicken.”
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