POP QUIZ

The skin, the largest organ of the human body, has two layers. What are they called?

* See answer, S4

POP QUIZ ANSWER:

The epidermis and the dermis are the two layers of the skin. The skin--which is about 2 square yards in a typical adult--has many roles, including assisting in preventing dehydration, and functioning as the body’s front-line buffer against bacteria, viruses and other infectious invaders. (Question on S1.)