The earth has a development history of billions of years, before us humans, on this earth, there is still a civilization?

Perhaps, there was indeed an extraordinary civilization on the earth in the past. Even, the pinnacle of civilization at that time was not inferior to everything we had at this time. Here, we might as well refer to them as "former inhabitants of the earth".

However, why did the civilization that existed at that time disappear into the long river of time on the earth? Even without leaving any trace of their existence? Could it be that they still exist on this earth today? It's just that they have changed in order to adapt to the earth's environment and other factors?

If there was indeed a generation of ancestors on the earth at the beginning? But what did the first generation of ancestors who lived on the earth go through? What kind of civilization did they create? Why did they completely fade out of the stage of the earth and disappear without a trace?

Natural disasters, man-made disasters, or natural selection?

Perhaps, everything is fate.

Perhaps, we are nothing more than a new reincarnation.

Perhaps, they are still silently protecting us. Just to protect the home they once lived!

There is no evidence, no clues, and even the initial explorations of our generation of civilization are now considered by us to be fantastical.

Just imagine, even the strange things recorded in the "Classic of Mountains and Seas" are no longer what we can understand and accept today. However, there are still people who try to prove the authenticity of the "Classic of Mountains and Seas" according to species from all over the world.

Perhaps, after waiting for the overlord of the grassland, the lion, to completely disappear from the earth, if there is no advanced video record, do we also have to describe its former glory as a "big cat"?

At that time, will the human beings living in the new environment also think that their ancestors are just exaggerating and fabricating a powerful creature that cannot exist on the earth?

What was the earth like billions of years ago, and what kind of civilization did the first generation of humans who lived on the earth create?

At this moment, is there an urge to act as a bystander, to witness the rise and fall of the "former inhabitants of the earth"?

But everything is just speculation......