Answer: D. Keratin
Explanation: Keratinocytes (pronounced: ker-uh-TIH-no-sites) make keratin, a type of protein that's a basic component of hair, skin, and nails. Keratin in the skin's outer layer helps create a protective barrier.
Explanation:
2 is B, 6 B ,7 A that's I know I hope this may help you
Answer:
show me the picture of the chart and I can tell you