Board Thread:Naruto Discussions/@comment-36950799-20180918174601/@comment-28568301-20181002024956

Actionmanrandell wrote: yes it does, a lifeless planet can't possibly have the levels of oxygen required for a life form to survive on. the only possible life that could survive on such a planet is microbial life. without the presence of oxygen rich forests and oceans there is no possibility of non microbial life on the planet. the assumption would than be logical to conclude that the chakra they have produces a life sustaining effect

We don't know how long since that planet lost its living inhabitant, and the process in which the oxygen is lost in the atmosphere is not rapid and fast, at least not fast in human timescale.