Carbon dioxide is a nonflammable gas that is naturally contained in the exhaled breath of humans.
(Carbon dioxide; is; a nonflammable gas that is naturally contained in the exhaled breath of humans) (a nonflammable gas; is naturally contained; in the exhaled breath of humans)
Carbon dioxide a nonflammable gas
is is naturally contained
a nonflammable gas that is naturally contained in the exhaled breath of humans
in the exhaled breath of humans