By now your cells have used the oxygen they need, and your blood is carrying carbon dioxide and other wastes that must leave your body.
(your cells; have used; the oxygen they need; T:By now) (the oxygen; need; they) (your blood; is carrying; carbon dioxide and other wastes that must leave your body) (carbon dioxide and other wastes; must leave; your body)
your cells the oxygen your blood carbon dioxide and other wastes
have used need is carrying must leave
the oxygen they need T:By now
they
carbon dioxide and other wastes that must leave your body
your body