What natural system purifies water? 1. sewage treatment plant
2. the water cycle
3. particles precipitate out in oceans and lakes
4. carbon filtration

The compound methyl butanoate smells like apples. its percent composition is 58.8% c, 9.9% h, and 31.4% o. what’s the empirical formula ?

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

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)