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I'm not sure if this is supposed to be a joke or not. There's no particular relationship between the color of the sky and the color of the grass. The photosynthetic compound in plants does need to absorb a color that the sky does not, but violet or red would work approximately as well as green, and there are in fact types of algae that use compounds other than chlorophyll and which are not green.

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15y ago

What else can I help you with?