Researchers
may
have
found
when
humans
first
spoke
?
1
.
6
million
____________________
____________________
.
____________________
____________________
eight
times
earlier
than
we
thought
.
Studies
show
that
the
first
human
language
came
from
Africa
.
____________________
____________________
said
speech
was
the
key
which
____________________
____________________
lot
of
human
physical
and
cultural
changes
possible
.
The
expert
____________________
____________________
book
about
language
.
He
says
our
brain
got
bigger
1
.
5
million
years
ago
.
An
area
for
language
developed
____________________
____________________
brain
.
Also
,
tissue
in
our
neck
made
sounds
and
speech
possible
.
Speech
allowed
humans
to
____________________
____________________
____________________
the
world
.
Humans
could
think
of
and
plan
things
,
and
____________________
____________________
knowledge
.
