Simple. Take oxygen and leave carbon dioxide. Take protein, fat and leave urea.
22:25, 30 April 2012
A quasiperiodic crystal, or, in short, quasicrystal, is a ...
Swamp is an area which is flooded or drenched with water ...
A map showing just enough geographic information to permit ...
The Great Blue Hole is a large underwater sinkhole off the ...
Occurs when solid, liquid, or gaseous volcanic materials ...
(1) An image which has been turned upside down, with ...
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