It is the earth's living lung--it breathes in carbon dioxide and breathes out oxygen.
(it; breathes out; oxygen) (it; breathes; L:in carbon dioxide) Context(it breathes,List([31, 42))):(It; is; the earth's living lung)
it breathes,List([31, 42))
it it It
breathes out breathes is
oxygen
L:in carbon dioxide
the earth's living lung