A) If water turbulence is very strong there
B) If nutrients are abundant and water turbulence is minimal
C) If nutrients are low but inorganic particle density is very high
D) All of the above

A) At the thermocline
B) At convergences near the surface
C) In quiet bays with little turbulence
D) All of the above

A) Reaches its peak of biomass at the time of day length is longest
B) Reaches its peak of biomass after the time of day length is longest
C) Attains a maximum of biomass when nutrients are still very concentrated in the surface waters
D) Does not end because of reduced day length