The
waterproof
layer
at
the
top
of
a
leaf's
surface
is
called
the
____________________
____________________
.
The
rows
of
cells
in
the
upper
mesopyll
is
called
the
____________________
layer
.
This
is
where
____________________
takes
place
.
These
cells
are
tightly
packed
together
and
contain
lots
of
____________________
which
harness
the
light
energy
.
Below
this
layer
of
cells
is
a
layer
called
the
____________________
____________________
.
This
is
where
gas
exchange
takes
place
through
the
____________________
on
the
bottom
surface
of
the
leaf
.
