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they have a necleous
neutral : neutral charge
the necleolus is the sub-organelle if the whole cell
You must mean "nucleus" -this is a central or essential part around which other parts are gathered or grouped.
The energy center of a cell is the mitochondria. Mitochondria are responsible for producing the majority of a cell's adenosine triphosphate (ATP), which is the main source of energy for cellular activities.