When aqueous solutions of nickel(II) sulfate and ammonium phosphate are combined, solid nickel(II) phosphate and a solution of ammonium sulfate are formed

Which ocean zone has the most abundant primary producer and why a) the abyssopelagic zone ,du to the absence of light and cold water temperatureb) the bathypelagic zone, due to the absence of light and cold water temperaturec) the mesopelagic zone ,due to uts high light availability and warm water temperature d) the epipelagic zone,due to its high light availability and warm water temperature