The
increasing
darkness
in
the
Northern
Hemisphere
this
____________________
of
year
"
indicates
to
the
plant
that
____________________
is
coming
on
.
So
it
starts
____________________
materials
from
the
____________________
before
they
drop
off
.
"
Evergreens
protect
their
needle
?
like
____________________
from
freezing
with
____________________
coatings
and
natural
"
antifreezes
.
"
But
broadleaf
plants
,
like
____________________
maples
,
birches
,
and
sumacs
,
have
no
such
protections
.
As
a
result
,
they
____________________
their
leaves
.
But
before
they
____________________
,
the
plants
first
try
to
____________________
important
nutrients
such
as
nitrogen
and
phosphorus
.
