B) identify at least 3 detailed similarities and 3 detailed differences between the gulf dead zone and the chesapeake dead zone (besides geography and eutrophication)

The three similarities and difference between these two zones are as

Explanation:

The dead zone is those that have a hyperoxic or low oxygen areas around the world caused by excessive nutrient pollution from human activities and other factors like salinization and sedimentation. The dead zones in the world are divided into Permanent, Temporary and seasonal.

Some similarities and differences found among them are listed as  

Maine dead zones: such as areas around these bays and seas have lots of acidic contents and dissolved salts. Algae bloom due to runoff and pollution: Runoff due to the overflowing of rivers and sediments brought by them create large and heavy algae growth. Estuary formation. Formations of estuary systems like at the mount of river and deltas formations.

Difference  

Located in Maryland, Virginia, and the Gulf of Mexico. The size of the Gulf of the Mexico dead zone is 22,730 sq kilometers and that of the Chesapeake bay is 320 kilometers. Economic impacts: They vary with ecological services etc. The greater impact has been seen in the gulf areas as 10 billion $ have already been wasted on cleaning the zone.

Argon, carbon-14, and carbon-12