Then, when the oxygen is returned to the lungs, the Tarshery breathes it out as carbon dioxide.
(the oxygen; is returned; to the lungs) (the Tarshery; breathes out; T:Then; T:when the oxygen is returned to the lungs)
the oxygen the Tarshery
is returned breathes out
to the lungs
T:Then T:when the oxygen is returned to the lungs