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.
Answer:
an opening into a vessel or cavity of the body.
Answer:
A. Deposition - sediment is set down in a new place
Answer:
d
Explanation:
This leads to unnecessary replication and out-of-control cell and tissue growth
