Your
ears
are
the
organs
of
____________________
.
They
have
three
parts
:
the
outer
ear
,
the
middle
ear
and
the
____________________
ear
.
The
ears
are
delicate
,
so
they
make
a
substance
called
earwax
that
protects
the
____________________
from
dirt
and
infection
.
¿
How
do
we
hear
things
?
1
.
Sound
waves
enter
through
the
____________________
ear
.
2
.
The
waves
hit
the
____________________
in
the
middle
ear
and
make
it
vibrate
.
3
.
This
vibration
makes
the
liquid
in
the
inner
ear
move
and
send
signals
to
the
____________________
.
4
.
The
brain
reads
the
signals
and
tells
you
what
are
you
hearing
.
