When you pull your skin and it drops slowly

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

Which of the following is the definition of ventilation as it relates to the respiratory system?

The nutrient facts label on a food package lists the following: iron 50%. what does this figure indicate?