Question

why fire flies glow at night only?

Answer 1

$\mathbb{\red{\huge{Heya\:mate}}}$

$\boxed{Here\:is\:your\:@nswer}$
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
━━━━━━━━━━━━━━━━━━━
THIS BEST APP IN THE WORLD 
▩━━━━○━━━◈━━━━○━━━▩
✴ NICE TOPIC BY THE WAY ✴

━━━━━━━━━━━━━━━━━━━

$\mathbb{\huge{\green{Hope\:it\:helps!!}}}$
$\mathbb{\huge{\green{Please\: Follow\:Me!!}}}$