Abeaker with saltwater was left uncovered and all water evaporated. if there are 0.505 g of nacl left in a beaker that originally contained 75.0 ml of saltwater, what must have been the concentration of the original solution?

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