In the following list, only is not an example of a chemical reaction

How would you reduce the volume of gas

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

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?