Advances
in
____________________
and
____________________
hygiene
have
been
fundamental
in
ensuring
that
people
are
healthier
and
have
a
longer
life
expectancy
.
To
prevent
food
spoiling
and
harming
us
when
we
eat
it
,
various
____________________
techniques
are
used
.
Food
____________________
,
as
well
as
telling
us
the
composition
of
the
product
,
have
an
____________________
date
and
best
-
before
____________________
.
The
water
that
reaches
our
homes
has
undergone
a
long
process
so
that
you
can
drink
it
safely
and
so
that
it
is
not
a
source
of
disease
.
This
process
is
called
____________________
____________________
.
____________________
advances
are
another
factor
that
increases
people's
life
expectancy
:
____________________
____________________
can
discover
diseases
early
.
____________________
help
prevent
many
diseases
.
The
most
common
____________________
techniques
are
laser
____________________
,
____________________
and
implants
.
____________________
have
helped
to
cure
or
alleviate
the
symptoms
of
many
diseases
.
