Biology involves structures on a wide range of scales from atoms to the entire planet.
| Examples | Fields of study | |
| Atoms | Carbon, Oxygen, Nitrogen | Chemistry |
| Molecule | Water, Methane, Carbon dioxide | Chemistry, Biochemistry |
| Macromolecule | Proteins, DNA | Biochemistry, molecular biology |
| Organelle | Nucleus, mitochondria | Cell physiology |
| Cell | Muscle cells, nerve cells | Cell physiology, histology |
| Tissue | Myocardium, Epithelium | Histology |
| Organ | Heart, Lungs, Brain | Anatomy |
| Organ system | Respiratory system | Anatomy |
| Organism | Lion | Anatomy |
| Population | Pride of lions | Ecology |
| Community | Lions and zebras | Ecology |
| Ecosystem | A community and its environment | Ecology |
| Biosphere | All life and its environment | Ecology |
CoMo Science 
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