Why magnesium, aluminium and iron metals cannot be identified by flame test

According to the tide table below what time of day will the highest tide occur?

What is the polyatamic ion of thiosulfate

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