Question

why fireflies glow at night

Answer 1

ur answer is 
Fireflies produce a chemical reaction inside their bodies that allows them to light up. This type of light production is called bioluminescence. ... When oxygen combines with calcium, adenosine triphosphate (ATP) and the chemical luciferin in the presence of luciferase, a bioluminescent enzyme, light is produced.

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Answer 2

Fireflies produce certain reactions inside there body...this type of reaction is bioluminescence...that is when O2 combines with ATP, Ca and luciferin ( a chemical) in presense of Luciferase which is an special enzyme. And light is produced.
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