The great similarity among all living things leads us to the conclusion that

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The great similarity among all living things suggests that they all share a common ancestry and had a single origin. This is supported by the theory of evolution, which explains the diversity of life on earth through the process of natural selection acting on random variations in heritable traits. It is not necessary to assume a conscious plan or that there is only one possible form of life in the universe. The fact that all life on earth shares similar features and basic biochemical processes suggests that it evolved from a common ancestor.

The Great Similarity Among All Living Things Leads Us to the Conclusion