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Plants can only use some wavelengths of light for photosynthesis. The plants in places where that light isn't present would die. If you had a field and lit it with light spread into a spectrum and planted seeds over the field, only the seeds that were planted where there was light that they could use would grow well. In the other parts of the field the plants would grow poorly or not at all. Given many generations you might get some plants that happened to produce slightly different chlorophyll and which would grow on parts of the field that other plants couldn't.