Question

how does cultural eutrophication affect aquatic ecosystems? it causes the water to get deeper. it has no significant impact. it improves biodiversity. it disrupts the balance of the ecosystem.

Explanation:

Cultural eutrophication is the enrichment of water with nutrients (like nitrogen, phosphorus) due to human activities. This leads to excessive growth of algae (algal blooms). When these algae die and decompose, oxygen in the water is depleted, harming aquatic life (like fish, invertebrates) and disrupting the food web and overall ecosystem balance. The first option is wrong as eutrophication leads to shallower water (due to sediment and organic matter accumulation). The second is wrong as it has significant impacts. The third is wrong as it reduces biodiversity (not improves) due to oxygen depletion and species die - offs. The fourth option correctly states that it disrupts the ecosystem's balance.

Answer:

D. It disrupts the balance of the ecosystem