What is Hydrogen carbons?

What effect might melting sea ice have for people who live in coastal areas?

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

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?