Theearthistheonlyplanetthatscientistsarecertainhaslife.Whatdoestheearthhavethattheotherplanetsdon’t?Foronething,theearthhasjusttherighttemperature.Asthethirdplanetfromthesun,theearthseemstobejusttherightdistanceaway.Theplanetsthatareclosertothesunaresohotthattheirsurfacesbakeinthesun.Thefarthestplanetsarecoldballs. | |||
A.temperature | B.water | C.oxygen | D.temperature,waterandoxygen |
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