Explain the difference between sequential and direct file access. A. Sequential access to data is used when the data has to be read from the start, in sequence. It is the norâ¦mal method of access for magnetic tape. Direct access is used when it is possible to jump directly to a file or data item without reading through all the items stored before it.
melanin (meËÂ·lÂ·nin), n a substance produced by melanocytes found in the deepest layer of the epidermis; protects the skin from the effects of the sun's harmful rays. Variations in skin color are a result of the level of melanin produced by each individual.
Layers of the Epidermis. The epidermis is made up of 95% keratinocytes but also contains melanocytes, Langerhans cells, Merkel cells, and inflammatory cells.The stratum basale is primarily made up of basal keratinocyte cells, which can be considered the stem cells of the epidermis.