Question

21 multiple choice 1 point main cause of the gulf’s dead zone:
○ agricultural nutrient runoff
○ overfishing
○ oil spills
○ deforestation
22 multiple choice 1 point nutrients washing into the gulf mainly come from:
○ california, nevada, oregon
○ louisiana only
○ florida, georgia, texas
○ ohio, iowa, illinois

Explanation:

Question 21

The Gulf's dead zone is mainly caused by agricultural nutrient runoff (like nitrogen and phosphorus from fertilizers) that leads to eutrophication, depleting oxygen. Overfishing affects fish populations, oil spills cause pollution but not the main dead zone cause, and deforestation is unrelated to Gulf oxygen depletion.

Nutrients washing into the Gulf (for the dead zone) mainly come from the Mississippi River basin, with states like Ohio, Iowa, Illinois in the upper basin contributing runoff. The other options are not in the main nutrient - contributing region for the Gulf.

Answer:

A. Agricultural nutrient runoff

Question 22