An
____________________
is
any
period
of
time
.
____________________
are
people
who
often
move
from
place
to
place
.
An
____________________
____________________
is
a
very
long
time
with
an
unusually
cold
climate
.
____________________
.
____________________
.
____________________
.
is
an
abbreviation
for
Before
the
Common
Era
.
A
____________________
is
a
human
species
that
went
extinct
.
____________________
means
died
out
.
____________________
is
the
genetic
code
found
in
cells
.
An
____________________
is
a
person
who
studies
old
cultures
and
artifacts
.
