Phase 1 of the creation of life on earth was that life on earth was from nothing. Small molecules were formed from atoms of carbon and hydrogen. Earth does not have any oxygen rather it contains CO2, methane, nitrogen, hydrogen and ammonia where they were from the eruptions of volcanoes.
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On the modern magnitude scale, Sirius, the star with the brightest apparent magnitude, has been assigned a magnitude of −1.5.
ec·o·sys·temDictionary result for ecosystem
/ˈēkōˌsistəm/Submit
nounECOLOGY
a biological community of interacting organisms and their physical environment.
(in general use) a complex network or interconnected system.