Answer:
The correct answer is Collagen and Keratin
Explanation:
Structural proteins are responsible for making structural components like bones, nails, cartilage, skin, etc. Some structural proteins are protective in function.
One of the most abundant structural protein present in vertebrates is collagen protein. It is the major structural protein which makes bone, cartilage, tendons, ligaments, muscles, skin.
Keratin is a fibrous protein found in eukaryotes. It usually forms hair, nail, feathers, horns, hooves and outer layer of skin in vertebrates and play important function in protection because it provides protective covering.
So, the correct answer is Collagen and Keratin
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