This is the topic that ancient alien theorists discuss. The aliens came here millions years ago and seeded the life of earth. Then they waited for the result. The appearance was that they didn’t get the proper result for the evolution of the life.
They decided to reshape the life on earth. Noah was the ambassador of aliens. Noah was told to select one of each species of earth. A flood was the event that might cause mass extinction. Then those samples of species would rise the life of earth after the flood.
We don’t have a certain proof for this theory but can it be true?