| A | B |
|---|
| vacuole | stores food, water, and other materials |
| lysosome | involved in the digestive activites of the cell |
| chloroplast | involved in the process of photosynthesis |
| divison of labor | keeps an organism alive |
| tissue | special function; second level |
| organ | group of tissue; third level |
| organ system | specific function for the organism; fourth level |
| mitochondrion | powerhouse of the cell in which cellular respiration occurs |
| ribosome | protein- making site of the cell |
| endoplasmic reticulum | substances are transported in |
| cytoplasm | region between the cell membrane and the nucleus |
| chromosome | directs the activities and passes on traits to new cells |
| nucleus | cell structure that directs all activities of the cell |
| cell | first level |
