Assume water upwelling to the surface (The equation is: (CH2)30(CH2O)76(NH3)17(H3PO4)) has a total carbon concentration =
2300 mmol m-3, oxygen concentration = 160 mmol m-3, nitrate concentration = 12 mmol m-3, and a phosphate concentration = 1.5 mmol m-3. Which of these given nutrients is likely to limit production if the light supply is adequate and there is no nitrogen fixation?