According to the video on personal hygiene, hepatitis A is a commonly transmitted bacterial infection caused by poor hygiene.

The purity of ecstasy is always in question, why? (short answer)

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

What are the two things that all sociologists do in their studies?