What is the primary light-emitting compound that fireflies use to produce their bioluminescent glow?
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Fireflies produce light through a chemical reaction involving the compound luciferin and the enzyme luciferase. This reaction is incredibly efficient, converting nearly 100% of the energy into light with almost no heat wasted. In contrast, aequorin is a different light-emitting protein found in bioluminescent jellyfish. Photo: Wikimedia Commons, Public domain.
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Source: Wikipedia (CC BY-SA)
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