Question

water pollution effects on aquatic life
increased turbidity (cloudiness) can cause what in aquatic ecosystems?
eutrophication
a reduction in sunlight

Explanation:

Turbidity refers to the cloudiness of water. When turbidity increases, suspended particles in the water scatter and absorb sunlight. So, more turbid (cloudier) water will let less sunlight pass through, leading to a reduction in sunlight available in the aquatic ecosystem. Eutrophication is mainly caused by excess nutrients (like nitrogen, phosphorus) leading to algal blooms, not directly by increased turbidity.

Answer:

A reduction in sunlight