How was your experience from changing a baby’s diaper? A question from my health class assignment.

Which of the following identifies a main culprit for america’s increasing weight gain

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

After fertilization zygote blank a) disappears b) begins to changes c) remains the same