What grey rock that has crinoids and brachiopods reacts to hydrochloric acid?

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

Is 9 correct? and can someone me with 10? it’s due tomorrow, you

Which three statements represent the benefits of performing experiments using computer simulations?