Which of these characterizes dead zones in the ocean?

Question

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Dead zones in the ocean are characterized by being hypoxic, which means that they have extremely low levels of dissolved oxygen. This makes it difficult for fish and other aquatic life to survive in these areas. The hypoxia is often caused by nutrient pollution from human activities, such as agricultural runoff and wastewater discharge, which leads to excessive growth of algae and other phytoplankton. As these organisms die and decompose, they consume oxygen, creating the hypoxic conditions.

Which of These Characterizes Dead Zones in the Ocean