Which term best describes zones in oceans with very low dissolved oxygen that support little marine life?

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Multiple Choice

Which term best describes zones in oceans with very low dissolved oxygen that support little marine life?

Explanation:
Oxygen-Depleted Zones describe parts of the ocean where dissolved oxygen is too low to support most marine life. Dissolved oxygen is needed for respiration, and in these zones the oxygen is consumed faster than it's replenished, often due to nutrient-rich runoff fueling decay in stratified waters. This leads to sparse life and “dead” areas where few organisms can survive. The other options point to pollution sources or processes (sewage runoff, raw sewage) or to saltwater intrusion, which involves salinity changes rather than sustained low oxygen in a zone.

Oxygen-Depleted Zones describe parts of the ocean where dissolved oxygen is too low to support most marine life. Dissolved oxygen is needed for respiration, and in these zones the oxygen is consumed faster than it's replenished, often due to nutrient-rich runoff fueling decay in stratified waters. This leads to sparse life and “dead” areas where few organisms can survive. The other options point to pollution sources or processes (sewage runoff, raw sewage) or to saltwater intrusion, which involves salinity changes rather than sustained low oxygen in a zone.

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