What are cell walls made of?\nOptions:\n- (A) fossils\n- (B) peat\n- (C) moss\n- (D) cations\n- (E) Carbon\n- (F) Fiber\n- (G) Fungi\n- (H) sodium
Let's think step by step below.
(F)
Plants use cellulose for their cell walls.

Basically, fiber is cellulose.

Cells walls are fiber.

.

So, the answer is (F)