Nearly all the chemical energy available to Earth’s lifeforms can be traced back to the sun. This is because light-harvesting (LH) supramolecules (two or more molecules held together by intermolecular forces) enable plants and some types of bacteria (typically at the base of the food chain) to leverage sunlight for driving photosynthesis. For these supramolecules to be effective, they need to have multiple pigments, such as chlorophyll, arranged in special structures that vary among species.
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Source: Phys.org