![fireflies](https://assets.shortpedia.com/uploads/2022/10/17/1665986840.webp?tr=w-1200,h-600,cm-pad_resize,bg-F3F3F3)
When an enzyme called luciferase is present, oxygen reacts chemically with calcium, adenosine triphosphate (ATP), a chemical called luciferin, and other substances inside the firefly's light organ to produce light.
When an enzyme called luciferase is present, oxygen reacts chemically with calcium, adenosine triphosphate (ATP), a chemical called luciferin, and other substances inside the firefly's light organ to produce light.