Chapter 1 mitochondria The mitochondria is the power house of a cell.It's Just like food for your body,because once you eat you feel that energy in your body.
Chapter 2 nucleus The nucleus is the control center of a cell.It acts like the brain or (think tank) of a human's body.It is in both plant cell and animal cell.
Chapter 4 membrane The cell membrane is the most water layer of a cell.It allows things to come in and out of the cell.Also like the door on your house