16. What is the missing nutrient in the HNLC waters like the Southern Ocean that is preventing phytoplankton to bloom?

a. chlorophyll

b. iron

c. carbon dioxide

d. oxygen

e. greenhouse gas

17. What is an HNLC Region?

a. High Nutrient, Low chlorophyll

b. High Nutrient, Low Chloritic

c. Heavy Nutritional, Light Consumption

d. Heavy Nitrogen, Level Consumption

e. High color, low carbon

18. What kind of negative implications could iron fertilization have on the ocean, at least potentially?

a) Reduce dissolved oxygen levels in seawater

b) potential harmful algae blooms

c) impact phytoplankton species diversity in blooms d) all of the above

e) none of the above