Multiple choice What layer on the outer surface of the exoskeleton makes it waxy? Cuticle Cellulose Chitin Chromatid Reveal answer Fill a bubble to check yourself A Correct answer Explanation The cuticle is the outer protective layer of arthropods that forms their exoskeleton. Its outermost sublayer, the epicuticle, contains waxes and lipids that prevent water loss and make the surface waterproof.