| A | B |
|---|
| cell | the basic unit of life |
| cell membrane | a thin layer that holds the cell materials inside it; it lets food, oxygen, water and waste flow in and out of the cell |
| cytoplasm | a colorless, jelly like substance inside cell that contains chemicals to break down food and produce energy for the cell to carry out its funtion |
| nucleus | part of the cell that controls all of the functions of the cell; the most important part of the cell |
| tissue | group of cells that work together to perform a common job |
| organ | tissues that are grouped together to perform a specific function |
| system | a group of organs that work together to perform a specific job for the body |
| human body | a group of systems that work together to keep the body functioning, healthy and alive |
