Which of the following is not a reason invertebrates are classified as pests?

Invertebrates are typically classified as pests when they negatively impact human activities or infrastructure. The correct answer, which states that invertebrates can support ecosystems, highlights a key aspect of their ecological role rather than a detriment. Invertebrates, including various species such as insects, mollusks, and crustaceans, contribute to nutrient cycling, serve as a food source for other organisms, and help maintain the balance of aquatic ecosystems.

While the other reasons indicate adverse effects of invertebrates—such as clogging pipes and water intakes, interfering with human activities, or impeding water flow and navigation—these actions align with the characteristics that often define invertebrates as pests. Supporting ecosystems acknowledges their importance and beneficial contributions, which is fundamentally at odds with the typical classification of pests, who usually have negative implications for human interests.