Why are spiders considered beneficial insects?

Spiders are considered beneficial insects primarily because they feed on other insects. This predation helps control the populations of various pest species, which can lead to significant benefits for agriculture and homeowners. By reducing the number of harmful insects, such as mosquitoes, flies, and other pests, spiders contribute to a natural balance within ecosystems and decrease the reliance on chemical pesticides.

While the other options mention characteristics that can be associated with other organisms, they do not adequately reflect the primary ecological role of spiders. For instance, producing silk for webs pertains to how spiders create their hunting structures, but it does not convey their importance in pest management. Pollination is typically the role of bees and other pollinators, while decomposition is largely carried out by fungi and certain insects, not spiders. Therefore, the action of preying on other insects solidifies spiders' reputation as beneficial in the ecosystem.