| A | B |
|---|
| Cell | the basic form of life; can be eukaryotic or prokaryotic |
| Tissue | a group of similar cells working together to perform a specific task |
| Organ | A group of tissues working together to perform a specific task |
| Organ System | A group of organs working together to perform a specific task |
| Organism | An individual living thing supported by its organ systems |
| Atoms | Building blocks of matter |
| Molecules | Groups of two or more atoms held together by chemical bonds |
| Organelle | A tiny cell structure that carries out a specific function within the cell (common examples are mitochondria, nucleus, chloroplasts) |
| Hierarchical Levels of Organization | atoms, molecules, organelles, cell, tissue, organ, organ system, organism |
| Organization of Living Things - Vascular System in Plants | -,  |
| Organization of Living Things - Muscular System | -,  |
| Organization of Living Things - Circulatory System | -,  |
| Organization of Living Things - Digestive System | -,  |
| Organization of Living Things - Skeletal System | -,  |
| Organization of Living Things - Respiratory System | -,  |
| Organization of Living Things - Nervous System | -,  |
