Fireflies glow at night due to bioluminescence, a chemical reaction in their light-emitting organs. The enzyme luciferase helps convert luciferin, oxygen, and ATP into oxyluciferin and light, producing a cool glow.

Fireflies glow at night due to bioluminescence, a chemical reaction in their light-emitting organs. The enzyme luciferase helps convert luciferin, oxygen, and ATP into oxyluciferin and light, producing a cool glow.