How do the numbers on the ph scale compare? example- is a ph of 4 twice as strong as a ph of 2? hint- the ph scale is not linear!

What is the ima of the 1 st class lever in the graphic given? 2 3 0.5

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

May someone me with these science questions