Keep it simple! Good search terms are usually one word (example - autism) or one very simple phrase (example - global warming). Do not search sentences or long phrases all in one search box, such as global warming effects on atmospheric conditions.
Try adding these subjects headings to narrow your search:
| Cell structures | Diffusion | Osmosis |
| Energy | Enzymes | Cell respiration |
| Protein synthesis | DNA and RNA | Cell division |
| Genetics | Heredity | Meiosis |