What geographic feature were most conductive to the development of early civilizations?

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

Organize the stages of tissue repair in the order in which they occur, starting with the first stage at the top.

Why mature red blood cells has no nucleus