What common feature do all insects in the order Homoptera share?

Insects belonging to the order Homoptera are characterized by their feeding habits, specifically their ability to suck plant sap. This trait is fundamental to their biology and ecology, as it allows them to feed on the phloem of plants, extracting nutrients necessary for their growth and development. This feeding behavior often influences the health of the host plants as well, sometimes leading to damage or transmission of plant diseases.

While some insects in this order may have wings, not all of them do, and wing structure can vary significantly among different species. The body shape of Homoptera insects can also diverge, as they exhibit a range of forms rather than a singular cylindrical shape. Finally, being carnivorous does not apply to Homoptera; they are classified as herbivorous since they feed primarily on plant materials, particularly sap. Thus, the correct choice highlights the distinctive sap-sucking feature that is central to the identity of insects in this order.