The humpback whales of the earth can only live in the aquarium because of human industry and civilization, and they are extinct. The same kind in other distant galaxies called out but did not get a response. They prepared to come and find it by themselves. The earth was raining heavily, and mankind was lost. Electricity is about to die. The Starfleet traveled through the 20th century and updated the dynamics of materials science and medicine. It has reversed the species killed by mankind in the past and will destroy mankind in the future. People and animals coexist peacefully.
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