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第3089节（第154401-154450行） (3089/3207)
evolution
by
suggesting
that
therewas
a
lot
of
movement
back
and
forth
between
cultures
and
regions.
“there’s
no
reason
tosuppose
that
people
only
went
in
one
direction,”
he
says.
“people
were
moving
all
over
theplace,
and
where
they
met
they
almost
certainly
shared
genetic
material
throughinterbreeding.
new
arrivals
didn’t
replace