Brittney,Melissa,Jackie

1. What are the tough patches of skin called that form when skin is exposed to great wear and tear? What is their function? What are they made out of? Tough patches of skin that form when the skin is wornout is called a callus. A callus is formed so the skin has more layers and is protected. They are made out of the top skin cells in the epidermal layer.

2. Why does your skin become darker when it is exposed to a lot of sunlight? Melanocyte makes melanin, which makes your skin darker to protect it from UV lights coming from the sun.