| ★ |  Food Chains - GCSE Biology (9-1) 9.7B | Mr Exham Biology @mrexhambio | 577 | Reino Unido | |
| 17 |  Genomes and PCR - A Level Biology | Mr Exham Biology @mrexhambio | — | Reino Unido | 72 |
| 18 |  Exchange and Transport - GCSE Biology (9-1) 8.1 - 8.2 | Mr Exham Biology @mrexhambio | — | Reino Unido | 72 |
| 20 |  Measuring Energy in Food - GCSE Biology (9-1) 1.14B | Mr Exham Biology @mrexhambio | 4.2K | Reino Unido | 70 |
| 6 |  Specialised Cells - GCSE Biology (9-1) 1.2 | Mr Exham Biology @mrexhambio | 2.8K | Reino Unido | 77 |
| 4 |  Eukaryotic and Prokaryotic Cells - GCSE Biology (9-1) 1.1 | Mr Exham Biology @mrexhambio | 2.7K | Reino Unido | 77 |
| 15 |  What is an ecosystem? - GCSE Biology (9-1) - 9.1 | Mr Exham Biology @mrexhambio | 2.6K | Reino Unido | 73 |
| 7 |  Diffusion, Osmosis and Active Transport - GCSE Biology (9-1) 1.15 | Mr Exham Biology @mrexhambio | 2.1K | Reino Unido | 76 |
| 8 |  Food Chain Energy Transfer and Loss - GCSE Biology (9-1) 9.8B | Mr Exham Biology @mrexhambio | 1.6K | Reino Unido | 75 |
| 10 |  Parasitism and Mutualism - GCSE Biology (9-1) 9.4 | Mr Exham Biology @mrexhambio | 1.3K | Reino Unido | 74 |
| 16 |  Antibiotic Resistance - A Level Biology | Mr Exham Biology @mrexhambio | 1.0K | Reino Unido | 73 |
| 11 |  Recycling Nutrients - GCSE Biology (9-1) 9.12 | Mr Exham Biology @mrexhambio | 936 | Reino Unido | 74 |
| 14 |  Biotic and Abiotic Factors - GCSE Biology (9-1) 9.2 | Mr Exham Biology @mrexhambio | 890 | Reino Unido | 73 |
| 1 |  The Carbon Cycle - GCSE Biology (9-1) - 9.13 | Mr Exham Biology @mrexhambio | 885 | Reino Unido | 83 |
| 3 |  Human Impacts on Biodiversity (Fish Farming/Invasive Species/Eutrophication) - GCSE Biology (9-1)9.9 | Mr Exham Biology @mrexhambio | 830 | Reino Unido | 78 |
| 13 |  Microscopy - GCSE Biology (9-1) 1.3 | Mr Exham Biology @mrexhambio | 746 | Reino Unido | 73 |
| 9 |  Fick's Law - GCSE Biology (9-1) 8.5B | Mr Exham Biology @mrexhambio | 601 | Reino Unido | 75 |
| 12 |  Food Security - GCSE Biology (9-1) 9.11B | Mr Exham Biology @mrexhambio | 584 | Reino Unido | 74 |
| 2 |  Studying Ecosystems - Core Practicals - GCSE Biology (9-1) 9.5 - 9.6 | Mr Exham Biology @mrexhambio | 562 | Reino Unido | 78 |
| 5 |  Preserving Biodiversity - GCSE Biology (9-1) 9.10 | Mr Exham Biology @mrexhambio | 546 | Reino Unido | 77 |
| 19 |  Propiedades biológicas, manejo y conservación del suelo en la agricultura | Ecosistema de Recursos Educativos Digitales SENA @ecosistemasenavirtual | 49 | Colombia | 72 |