Which of the following statements about the renewal of the outer skin layer is true?

• A. It never regenerates after maturity.
• B. It regenerates but only during sunshine.
• C. It is constantly dying and being replaced by new cells.
• D. It changes color but not structure.

Answer: (C)

The main idea is that the outer skin layer is in constant turnover. The epidermis continually produces new cells at the base; these cells move upward, become keratinized, and eventually die to form the outer protective layer. As this happens, old dead cells are shed and replaced by new ones. This cycle happens continually, not only at certain times or under specific conditions, so the outer skin is always renewing itself.

That’s why the statement describing it as constantly dying and being replaced by new cells is the best answer. It captures the ongoing,slate-like renewal of the skin rather than suggesting it only happens once, only in sunlight, or that changes are limited to color without structural change.