Question

How can the dissolved oxygen rebound in the recovery zone? a the excess nutrients have been diluted that far away from the dead zone. b the presence of nitrogen and phosphorus here has less effect. c the organisms here need less dissolved oxygen to survive than those in the clean zone. d the biochemical oxygen demand goes up in the recovery zone.

Answer 1

Answer: Excess nitrogen and phosphorus can cause algae blooms. The overgrowth of algae consumes oxygen and blocks sunlight from underwater plants.

Step-by-step explanation: