PL HEL How does the pH of the mixture change as sulfuric acid is slowly added to a solution of sodium hydroxide? *

The pH decreases to 7 and stops.
The pH increases and may go above 7.
The pH decreases and may go below 7.
The pH increases to 7 and stops.

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