In the disorder called "dissociative identity disorder," the "alters," or distinct personalities: O a. may all be present simultaneously.
O b. are typically all the same age.
O c. are typically all the same gender.
O d. can be of different ages and sexes.

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