The Integument: List the embryonic germ layers from which the epidermis and dermis are derived (be specific for the dermis). (2 points) The dermis is derived from the mesoderm. It is made up of layers of cells originating from the lowest layer called the basal layer, which constantly undergoes mitosis. The epidermis is derived from the ectoderm. The development of hair, feathers, teeth, and scales all depend on the same structure. What is it called? (2 points) Skin papillaHow do reptile scales differ from fish scales? (2 points) The scales of a reptile are found in the epidermis of the skin while the scales of a fish are found in the dermis of the skin which is located beneath the epidermis. All reptilian scales have a dermal papilla underlying the epidermal part. Compare and contrast rhino horns, antlers, and giraffe horns in terms of contributions from the epidermis and dermis. (4 points)The horns are composed of a bony core covered with a keratin sheath. Unlike antlers, horns are never branched. Rhino horns differ from true horns because their horns do not have a core or sheath. They are made up of numerous epidermal cells and bundles of dermal papillae, extensions of the dermis. The cells of each papilla form a horny fiber similar to thick hair. These fibers are not real hair. True hairs grow from follicles that extend into the dermis, while rhino horns grow from dermal papillae that extend into the horn. Giraffe horns are paired, short, permanent bony processes covered with skin and hair. They differ from other horns in that they do not protrude from the frontal bones, but rest on the sutures between the frontal and parietal bones. The antlers are not formed in the epidermis and are not made of keratin but are......paper means......rdle is attached to the axial skeleton. (5 points)Fish fins have certain basic structures in common. What are the two sets of skeletal elements that make up the basic fin of the fish? What type of paired fin has: 1) preaxial and postaxial elements, 2) only preaxial elements? (4 points) Two sets of skeletal elements that make up the basic fin of the fish are the archipterigian and metapterigian fins. The archipterygial has both preaxial and postaxial elements. The metapterygial has only preaxial elements. How do artiodactyls differ from perissodactyls? (2 points) Artiodactyls are even-toed ungulates whose weight is supported approximately equally by the third and fourth toes, rather than primarily or entirely by the third as in the odd-toed ungulates called perissodactyls. Perissodactyls have an odd number of toes and the middle toe of each hoof is usually larger than that of its neighbors..