Which of the following is NOT true about the body mass index?
A. uses statistical data of weight and height across the population
B. measures the percentage of one's body fat directly
C. relies on a correlation between weight and body fat
D. does not account for one's body frame size or muscle content

Melanocytes and keratinocytes work together in protecting the skin from uv damage when keratinocytes a. provide the melanocyte with a protective shield against abrasion b. maintain the appropriate temperature so the product of the melanocyte will not denature c. maintain the appropriate ph in order for the melanocyte to synthesize melanin granules d. accumulate the melanin granules on their superficial portion, forming a uv-blocking pigment layer