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What is the meaning of human existence?

From a biological point of view, the meaning of human life is to "pass on genes", that is, "reproduce". In the complicated and changeable environment, the emergence of intelligent creatures like human beings, who pass on their own genes, increases more possibilities for the future of life, because in the future, the earth will gradually become unsuitable for life, and human beings can leave the earth with the help of high-tech spacecraft to find other habitable planets in the universe and let life spread all over the universe.