Which years did all of the Classical Civilizations exist?

between the 8th century BC and the 6th century AD  

Explanation:

The classical civilizations is the time period when ancient Greek culture started to influence Europe. The time when things such as art, literature, science, and religion started to flourish.

On top of all of those things, There is one other important contribution that the classical civilization give to the world. It is the introduction of Democracy. This concept help the world transitioned from societies run by kings and nobles to societies that are run by the will of the people.

answer; i believe that the correct answer is rapid and subsequently slow down;