How old is a Megalodon

The earliest megalodon fossils (Otodus megalodon, previously known as Carcharodon or Carcharocles megalodon) date to 20 million years ago. For the next 13 million years the enormous shark dominated the oceans until becoming extinct just 3.6 million years ago

Explanation:

it should be a. song dynasty’s civil service examination system created an administrative bureaucracy manned by the landed aristocracy.