In the story, evidence that the left-handed twin possesses qualities includes doing things backward and ruling in the dark world below the earth.
The evidence from "The World on Turtle's Back" that best supports the conclusion that the left-handed twin has qualities is:
In the story, the left-handed twin is characterized by performing actions in an unconventional or opposite manner and residing in the dark world beneath the earth, which aligns with the qualities associated with left-handedness in various contexts.
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