The cell in the diagram below illustrates a stage of mitotic cell division.

Letter B indicates the organelle called
The phrases below describe several events that occur during the process of mitosis. Put the stages of mitosis in the correct order according to these descriptions. (Drag and drop into the correct sequence of events.)
Nuclear membrane disapperas, spindle fibers appear at centrioles.
Two nuclear membranes form.
Chromosomes line up in the middle of the cell, and spindle fibers attach to them.
Chromosomes are pulled apart, with each half of a set going to opposite sides of the cell.
How many chromosomes will be found in each of the two new cells formed as a result of mitotic cell division?
In the diagrams of mitotic cell division shown, which structure is present in diagram B but not in diagram A?
