Is it possible that other numerous civilizations existed before mankind?

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Mr.Investigator

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I know that the earth is a planet that is 4.5billion years old. And I came to wonder if other civilizations before ours could have existed. Even though we know that dinosaurs and other species were on the earth through fossils, what if those civilizations were so old that their remnant doesn't exist? Is this idea anthropologically possible? Help plz. Thanks
 
Hmmmmm, If you are referring to inter celestial civilizations, the reality of their existence still remains a mystery. Civilization refers to the human species. So, as far as we know, there may be undiscovered civilizations created by the human species. Time will tell.
 
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