The correct answer is Certain flightless beetles have wings. Their wings are an example of an adapted structure.
These beetles have adapted structure in them and it is inherited from their ancestor's gene pool. as the time passes by the flightless beetles don't have wings as it was not needed but later become adopted due to environmental needs.
<h3>What is adapted structure?</h3>
Thick, hardened beetle wings, called elytra, cover the whole body and it has covered whole body of beetles. The adaptive features are inherited from their ancestor's gene pool.
Hence concluded that adapted structures in flightless beetles have wings. Their wings are an example.
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