Here's a breakdown:

* Cell membrane: This is the outermost layer of the cell, separating the cytoplasm from the external environment.

* Cytoplasm: This is the jelly-like substance that fills the space between the cell membrane and the nucleus.

* Nucleus: This is the control center of the cell, containing the genetic material (DNA).

Think of it like this:

* The cell membrane is the wall of the house.

* The cytoplasm is the living room, kitchen, and all the other rooms inside the house.

* The nucleus is a special room within the house that holds all the important blueprints.