Why did Thanos snap his fingers? What did it cost?

What forms when chemical reactions combine pollution with sunlight?

What is the correct term for living the most sustainable life you can within your current circumstances?

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