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Oxigenul(O)

Oxigenul (O2) reprezintă 21% din aer și este un element esențial pentru supraviețuirea tuturor vietuițoarelor de pe Pământ. Există totuși bacterii care pot trăi fără prezența oxigenului (de exemplu, bacteriile sulfuroase).Oxigenul este un element chimic d
by

Andreea Badea

on 14 November 2011

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