Question

“dead zones” are a phenomena that took place in the great lakes that prevented many organisms from surviving. which of the following could be a possible cause of a “dead zone”? a depletion of, or large decrease in, dissolved oxygen levels more sunlight reaching areas deeper in the lakes extreme decrease in mercury and metals rates a reduction of the turbidity of the water

Explanation:

Dead - zones are areas in water bodies with low dissolved oxygen levels, which are harmful to most aquatic life. Dissolved oxygen is crucial for the survival of organisms in water. When it depletes, organisms can suffocate and die. More sunlight reaching deeper areas can promote photosynthesis and potentially increase oxygen in some cases. A decrease in mercury and metals is beneficial for organisms. Reducing water turbidity can also be positive for light penetration and organism survival.

Answer:

A. A depletion of, or large decrease in, dissolved oxygen levels