Biology · GCSE · Evolution & Inheritance
Natural selection — the evidence
Natural selection — the evidenceFree3:15Heddy Score 3 of 7, below the standard
What you need to know
- Darwin's Galapagos finches had beaks that matched the food on each island.
- He proposed that individuals better suited to the environment leave more offspring, so the population changes.
- Peppered moths illustrate it: pale moths were hidden on clean bark, then dark moths became common when soot blackened the trees.
- The same idea led him to say that humans share an ancestor with other apes.
In this clip
Runs 3:15, from 0:09 to 3:24 of the full video.
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 works1.32M views · 7.47K likes · Cornerstones Education 3.68K subscribers
As reported by YouTube on 2026-11-03. Not part of the Heddy Score.Why we picked it
Finches and peppered moths give two short, visible cases of selection changing a population.
Cornerstones Education on YouTubechecked 2026-10-20
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