Which of the following is an example of a beneficial insect?

A pest predator is categorized as a beneficial insect because it helps control pest populations in an ecosystem. Pest predators, such as ladybugs and lacewings, feed on various harmful pests, which can damage crops and plants. By maintaining the balance of the ecosystem, these beneficial insects contribute to natural pest management, reducing the need for chemical pesticides and promoting healthier plant growth.

In contrast, mosquitoes, leafcutter ants, and fruit flies have various roles in ecosystems that do not contribute to pest control in the same beneficial manner. Mosquitoes are primarily known for being pests themselves, as they can transmit diseases. Leafcutter ants play a critical role in their environment but are more known for their impact on plant life rather than being beneficial predators. Fruit flies, while important for processes such as decomposition and serving as a food source for other animals, do not act as pest predators and can be associated with infestations in fruits.