As big as it is, the ocean is nutrient-limited. If you wanted to investigate this, one reasonable avenue would

Question

a.follow whale migrations in order to determine where most nutrients are.

b.observe antarctic ocean productivity and compare that to other areas.

c. Experimentally enrich some areas of the ocean and compare them to unmanipulated areas.

d. B and C only

e. A, B, and C

Answer 1

e     A, B and C