The cells of the upper and lower outer surface of a plant leaf are covered by a thin, waxy layer called the (a) parenchyma.
(The cells of the upper and lower outer surface of a plant leaf; are covered; by a thin, waxy layer) (a thin, waxy layer; called; the (a) parenchyma)
The cells of the upper and lower outer surface of a plant leaf a thin, waxy layer
are covered called
by a thin, waxy layer
the (a) parenchyma