Why don't luna moths have mouths?

Answer: Adult stage doesn't eat

They absorb nutrients through skin — Wrong. Luna moths don't absorb nutrients through skin. They literally don't eat as adults—they survive on energy stored from their caterpillar stage.

Genetic mutation over time — Wrong. Lack of mouthparts isn't a mutation—it's evolved adaptation. As adults, luna moths live only 7-10 days solely to mate and reproduce, not to feed.

Adult stage doesn't eat ✓ — Correct! Adult luna moths emerge with no mouth, digestive system, or way to eat. They survive entirely on fat reserves stored as caterpillars. Their only purpose: find a mate and reproduce within one week. This strategy works—they invest all energy into reproduction, not feeding!