They take in oxygen, which body cells need to live and carry out their normal functions, and rid the body of carbon dioxide, a waste product of the cells.
(They; take; L:in oxygen) (which body cells; rid; the body of carbon dioxide) (which body cells; need; to live and carry out their normal functions) Context(which body cells need,List([21, 42))):(which body cells; need to live; ) Context(which body cells need,List([21, 42))):(which body cells; need to carry out; their normal functions)
which body cells need,List([21, 42)) which body cells need,List([21, 42))
They which body cells which body cells which body cells which body cells
take rid need need to live need to carry out
L:in oxygen
the body of carbon dioxide
to live and carry out their normal functions
their normal functions