The
lungs
are
____________________
that
they
think
in
the
____________________
that
they
____________________
in
way
the
____________________
.
To
level
of
the
lungs
,
the
____________________
contained
in
the
air
goes
on
to
the
____________________
while
the
carbon
____________________
contained
in
the
blood
____________________
on
the
____________________
