Since
ancient
times
,
it
has
been
clear
that
the
color
of
human
skin
is
not
distributed
____________________
on
the
planet
.
The
skin
of
the
inhabitants
of
the
Ecuadorian
region
is
____________________
,
while
the
skin
of
those
who
inhabit
colder
regions
is
clear
.
A
recent
hypothesis
proposes
that
the
variety
of
colors
is
an
adaptation
that
allows
the
inhabitants
of
different
environments
to
maintain
the
levels
of
____________________
D
and
folate
that
their
organisms
need
.
"
It's
not
that
race
does
not
exist
,
"
wrote
anthropologist
Jonathan
Marks
,
"
.
.
.
it's
that
race
does
not
exist
as
a
biological
entity
.
Race
undoubtedly
exists
as
a
symbolic
and
social
category
.
Scientists
prefer
to
talk
now
about
human
populations
that
have
their
own
and
visible
characteristics
(
skin
color
,
hair
type
,
eyelid
shapes
,
face
and
body
)
.
Human
skin
,
whose
color
varies
between
the
dark
brown
of
Central
Africans
and
the
pale
pink
of
Northern
Europeans
,
owes
its
color
to
the
presence
of
a
pigment
called
melanin
.
The
amount
of
____________________
-
producing
cells
is
more
or
less
the
same
in
all
people
.
What
varies
-
and
originates
the
diversity
of
colors
-
is
the
amount
of
pigment
produced
.
Melanin
in
the
skin
plays
an
important
protective
role
by
absorbing
ultraviolet
(
UV
)
radiation
.
The
Sun
emits
different
types
of
UV
radiation
.
UVA
radiation
reaches
the
blood
vessels
that
supply
the
deepest
layers
of
the
skin
and
destroys
the
folate
transported
by
the
blood
(
an
essential
nutrient
for
DNA
biosynthesis
)
.
It
is
true
that
dark
skin
is
less
prone
than
clear
skin
to
develop
cancer
by
exposure
to
UV
radiation
.
However
,
this
type
of
cancer
is
not
usually
fatal
during
the
____________________
age
.
According
to
the
____________________
of
Evolution
,
a
characteristic
is
considered
____________________
when
it
favors
the
reproductive
capacity
of
those
who
possess
it
.
Science
has
shown
that
the
concept
of
human
races
lacks
biological
foundation
,
and
that
the
coloration
of
the
skin
can
be
explained
in
terms
of
adaptations
to
different
environments
.
Will
these
findings
be
sufficient
for
race
to
cease
to
exist
in
the
minds
of
fanatics
and
profiteers
,
and
for
the
color
of
their
skin
to
cease
to
be
the
source
of
____________________
for
millions
of
people
?
