Ya like jazz,
#mayonnaise

Cell division occurs when one cell divides to produce two new cells. Unicellular organisms use cell division to reproduce. Multicellular organisms use cell division for growth and repair of damage such as wounds.

it is the background information on the characters and setting explained at the beginning of the story. the exposition will often have information about events that happened before the story began. the exposition is often the very first part of the plot.