Amonitor's screen is divided up into millions of tiny dots, called

Pixel

Explanation:

A pixel is a physical point in an image which represents the smallest controllable element of a picture that appears on a display device. This means that a pixel is the smallest unit of a picture, and each monitor screen is divided into millions of these. In general, the more pixels an image in a monitor has, the more accurate representation of the original we get.

cell differentiation  is how generic embryonic  cells  become specialized  cells. this occurs  through a process called gene expression. gene expression is the specific combination of genes that are turned on or off (expressed or repressed), and this is what dictates how a  cell  functions.

explanation:

current flows in a wire