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the coral gets a low level of oxgyen from it prey
Ozone is both good and bad form of oxygen. It is good at atmosphere level and bad at ground level.
not your business
Yes
No, it is not.
YES!!! 20 % of the atmosphere is oxygen. Many minerals have oxygen combined in their ores. e.g. Iron Ore, (Ferric Oxide)( Fe2O3). Water molecules contains one atom of oxygen .
No, it is an element.
helium
gas
20.94 % in our atmosphere.
what is the normal sugar level
Hemoglobin.....