| ★ | Resources and population growth | Middle school Biology | Khan Academy | | 3.9K | Estados Unidos | |
| 6 | Accumulate, Vast, Consist | Vocabulary | Khan Academy | | — | Estados Unidos | 89 |
| 8 | Project preview: Paint battle | Intro to CS - Python | Khan Academy | | — | Estados Unidos | 88 |
| 9 | Reinforce, Maximum, Foundation | Vocabulary | Khan Academy | | — | Estados Unidos | 87 |
| 10 | Benefit, Philosophy | Vocabulary | Khan Academy | | — | Estados Unidos | 87 |
| 11 | Conservation of energy (part 2) | AP Physics | Khan Academy | | — | Estados Unidos | 87 |
| 13 | Prominent, Contrast | Vocabulary | Khan Academy | | — | Estados Unidos | 87 |
| 15 | Conservation of energy (part 1) | AP Physics | Khan Academy | | — | Estados Unidos | 86 |
| 16 | Simulation, recreation, leisure | Vocabulary | Khan Academy | | — | Estados Unidos | 86 |
| 18 | Contradiction | Vocabulary | Khan Academy | | — | Estados Unidos | 86 |
| 20 | The periodic table | Chemistry | Khan Academy | | 28.8K | Estados Unidos | 86 |
| 3 | Managing natural resources | Middle school Earth and space science | Khan Academy | | 20.3K | Estados Unidos | 92 |
| 19 | Object composition | Intro to CS - Python | Khan Academy | | 13.5K | Estados Unidos | 86 |
| 4 | Biotic and abiotic factors | Middle school Biology | Khan Academy | | 7.1K | Estados Unidos | 90 |
| 1 | Ecological interactions | Middle school Biology | Khan Academy | | 5.6K | Estados Unidos | 92 |
| 2 | Protecting natural resources | Middle school Earth and space science | Khan Academy | | 2.3K | Estados Unidos | 92 |
| 5 | Project preview: Natural selection | Intro to CS - Python | Khan Academy | | 1.5K | Estados Unidos | 89 |
| 7 | Objective | Vocabulary | Khan Academy | | 1.4K | Estados Unidos | 88 |
| 12 | Demonstrate, Hypothesis, Accurate | Vocabulary | Khan Academy | | 1.1K | Estados Unidos | 87 |
| 14 | Adapt, Collaborate, Criticize | Vocabulary | Khan Academy | | 502 | Estados Unidos | 87 |
| 17 | Vague, Interpret | Vocabulary | Khan Academy | | 453 | Estados Unidos | 86 |