The answer to this question is ID
According to Freud's psychoanalysis, human's id already exists ever since we're born. It allows us to experience pleasure from several stimuli such as food, ticklish touch, warm hugs, etc.
Since all of these stimuli cause positive impacts to us, we will constantly seek this stimulus even as we grow up.
A plant cell has a cell wall and it is like a rectangle or close to a square
A animal cell is shaped kind of like a jellybean and its vacuoles are smaller tan a plant
The County System of Units supported segregation through laws that promoted the condition of being separated from races that, according to them, were considered inferior to white; creating divided common spaces for the different groups of races, which were classified according to their ancestry, social and economic.