The fireflies glow because of the exergonic reactions that use chemicals to emit photons of light as the energy output.
What are exergonic reactions?
Exergonic reactions are the type of chemical reactions that release photons as the energy source in the outer surrounding. Chemiluminescence or bioluminescence is the result of exergonic reactions.
These reactions happen spontaneously and release light as the output from the chemical energy and oxidation-reduction of several enzymes.
Therefore, bioluminescence occurs because of the exergonic reactions.
Learn more about exergonic reactions here:
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