Answer:
Explanation:
although the ancient roman civilisation was not an emmpire until its last few centuries of rule,it is still regarded as one of the greatest empires
i guess this is the answer
1. About 200 million years ago, 2. Cenozoic era, 3. The period between the extinction of the dinosaurs and the present day is called the Age of Mammals or Cenozoic. Mammals appeared on the earth long before the extinction of the dinosaurs
