Earth's atmosphere is approximately 78.0% nitrogen and 21.0% oxygen. What is the mass in grams of oxygen in a cubic meter of air in a typical classroom at 1 atm and 25° C? ( 1 m³ = 1000 L)

Balance this equation co2(g) + h2o (g) show that the balanced equation obeys the law if conversation of mass

How heavy is thanos? a) 3000 lbs b) all of it c) the price of tea in china d) heavy enough

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