A distinguishing feature of beetles is:

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Beetles possess a unique characteristic in that they have leathery front wings, known as elytra, which meet in a straight line down the back when closed. This structural adaptation is integral to their identity, as elytra serve to protect the delicate membranous wings underneath, as well as their abdomen, during flight and while at rest. The meeting of the elytra in a straight line is a distinguishing feature that helps differentiate beetles from other insects, which may have different wing structures or covering styles.

The other options do not reflect the defining traits of beetles as accurately. For instance, not all beetles have furry bodies; some may have smooth surfaces instead. While it is true that some insects have membranous wings, this description is more applicable to other groups of insects rather than beetles. Lastly, the presence of long antennae is not exclusive to beetles, as many types of insects exhibit a variety of antenna lengths and shapes. Thus, the unique structure of beetles’ elytra is what sets them apart and defines their classification within the insect world.

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