| ★ |  Alveoli - GCSE Biology (9-1) 8.3 | Mr Exham Biology @mrexhambio | 551 | Reino Unido | |
| 7 |  Exchange and Transport - GCSE Biology (9-1) 8.1 - 8.2 | Mr Exham Biology @mrexhambio | — | Reino Unido | 70 |
| 19 |  Genomes and PCR - A Level Biology | Mr Exham Biology @mrexhambio | — | Reino Unido | 66 |
| 15 |  Factors Affecting Rate of Diffusion - GCSE Biology (9-1) 8.4B | Mr Exham Biology @mrexhambio | 4.7K | Reino Unido | 66 |
| 3 |  Specialised Cells - GCSE Biology (9-1) 1.2 | Mr Exham Biology @mrexhambio | 2.8K | Reino Unido | 72 |
| 1 |  Eukaryotic and Prokaryotic Cells - GCSE Biology (9-1) 1.1 | Mr Exham Biology @mrexhambio | 2.7K | Reino Unido | 75 |
| 9 |  Viruses - A Level Biology | Mr Exham Biology @mrexhambio | 2.7K | Reino Unido | 68 |
| 6 |  Diffusion, Osmosis and Active Transport - GCSE Biology (9-1) 1.15 | Mr Exham Biology @mrexhambio | 2.1K | Reino Unido | 70 |
| 2 |  Food Tests Core Practical - GCSE Biology (9-1) 1.13B | Mr Exham Biology @mrexhambio | 1.8K | Reino Unido | 72 |
| 20 |  Monohybrid Inheritance - A Level Biology | Mr Exham Biology @mrexhambio | 1.3K | Reino Unido | 65 |
| 4 |  Biotic and Abiotic Factors - GCSE Biology (9-1) 9.2 | Mr Exham Biology @mrexhambio | 890 | Reino Unido | 70 |
| 8 |  The Carbon Cycle - GCSE Biology (9-1) - 9.13 | Mr Exham Biology @mrexhambio | 885 | Reino Unido | 69 |
| 16 |  Human Impacts on Biodiversity (Fish Farming/Invasive Species/Eutrophication) - GCSE Biology (9-1)9.9 | Mr Exham Biology @mrexhambio | 830 | Reino Unido | 66 |
| 13 |  Microscopy - GCSE Biology (9-1) 1.3 | Mr Exham Biology @mrexhambio | 746 | Reino Unido | 67 |
| 10 |  Fick's Law - GCSE Biology (9-1) 8.5B | Mr Exham Biology @mrexhambio | 601 | Reino Unido | 67 |
| 12 |  Food Security - GCSE Biology (9-1) 9.11B | Mr Exham Biology @mrexhambio | 584 | Reino Unido | 67 |
| 5 |  Food Chains - GCSE Biology (9-1) 9.7B | Mr Exham Biology @mrexhambio | 577 | Reino Unido | 70 |
| 14 |  Studying Ecosystems - Core Practicals - GCSE Biology (9-1) 9.5 - 9.6 | Mr Exham Biology @mrexhambio | 562 | Reino Unido | 67 |
| 11 |  Preserving Biodiversity - GCSE Biology (9-1) 9.10 | Mr Exham Biology @mrexhambio | 546 | Reino Unido | 67 |
| 18 |  El arte de planear qué comer, introducción al tema: prevención de la obesidad y sobrepeso. | Omar Ramsés Orozco Delgado @roodel1 | 14 | — | 66 |