1) Which structures contain keratin?
epidermis, dermis, muscle fibers, veins, pores, hair, hair follicles, or sweat glands.

2) Explain how the dermis enables the body to interact with the external environment.

3) How are hair and nails similar in structure?

Thank you for helping me on these 3 questions.
My teacher has us answer the questions in 3 sentences or less, so if it is possible can u please try to respond to the questions in 1-3 sentences? Thanks soo much.