Question

a. number the following steps of the keratinization process from beginning
the hair strand emerges from the scalp.
the cells move upward, lose their nucleus, and die.
cells mature and fill up with keratin.
the hair strands cells are completely keratinized.
the hair strands cells are dead.

Explanation:

Keratinization in hair starts with cell - maturation and keratin - filling. Then cells move upward, lose their nucleus and die. After that, the hair strand's cells are completely keratinized, then the cells are dead, and finally the hair strand emerges from the scalp.

Answer:

1. Cells mature and fill up with keratin.
2. The cells move upward, lose their nucleus, and die.
3. The hair strand's cells are completely keratinized.
4. The hair strand's cells are dead.
5. The hair strand emerges from the scalp.