Do
twins
always
look
the
same
?
The
answer
is
____________________
.
There
are
two
types
of
twin
.
____________________
twins
looks
exactly
alike
,
but
other
twins
are
called
____________________
:
they
don't
look
____________________
.
Fraternal
Twins
are
much
more
common
____________________
identical
twins
.