Question

30. Who found out that the glow-worms glow because of a chemical present in their bodies?
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Answer 1

Adult female glow-worms have a large, light-producing organ at the end of their abdomens. ... In glow-worms, a molecule called luciferin is combined with oxygen to create oxyluciferin. A chemical reaction with the light-emitting enzyme luciferase produces their illuminations.