Biology · KS3 Y9 · Evolution & Inheritance
Biodiversity
BiodiversityFree2:15Heddy Score 3 of 7, below the standard
What you need to know
- Biodiversity is the variety of species on Earth, and the word is also used for the variety in one ecosystem.
- It matters because species depend on each other for food and shelter, and they help to keep the physical conditions stable.
- A community with many species is less likely to collapse if one population falls.
- Deforestation reduces biodiversity, including when forest is cleared to grow crops for biofuels.
Heddy ScoreSeven checks every clip must pass before students see it: trusted, on the map, accurate, focused, accessible, safe, and proven by students.3/7, Below the standard
See the seven stars
- Trusted source · passed. The creator's own upload, live and playable here.
- On the map · not judged yet. A teacher watched it: it mainly teaches this map topic.
- Spec-true · not judged yet. Accurate, and right for the current UK specification.
- Focused · passed. One idea, short enough to watch in one go.
- Accessible · passed. Good captions, clear sound and pictures.
- Safe for children · not judged yet. Right for 11 to 16 year olds, with no sales pitch.
- Proven · not judged yet. Earned from our students: they learn from it, find it helpful and watch it to the end.
Our students
Not enough students yet
Our own students' answers. These are what move ★7 Proven.On YouTube
How the Heddy Score works294K views · Freesciencelessons 995K subscribers
As reported by YouTube on 2026-11-02. Not part of the Heddy Score.Why we picked it
It defines biodiversity, explains why variety makes an ecosystem more stable, and shows deforestation as a cause of loss.
Freesciencelessons on YouTubechecked 2026-10-18
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