Biology · KS3 Y9 · Evolution & Inheritance

Darwin's theory

Darwin's theoryFree5:13Heddy Score 3 of 7, below the standard

What you need to know

  • Darwin collected specimens on the Beagle voyage and noticed that Galapagos tortoises differed between wet and dry islands.
  • Malthus's idea of a struggle for limited food helped him see that not every individual leaves offspring.
  • Individuals born with a helpful trait reproduce more, so that trait becomes more common.
  • He concluded that species, including humans, share ancestors, and Wallace reached a similar conclusion.

In this clip

Runs 5:13, from 0:00 to 5:13 of the full video.

Heddy Score3/7, 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.
★ passed · ☆ pending · ✕ failed
Our students

Not enough students yet

Our own students' answers. These are what move ★7 Proven.
On YouTube

1.71M views · 28.1K likes · BBC News 20.2M subscribers

As reported by YouTube on 2026-11-01. Not part of the Heddy Score.
How the Heddy Score works

Why we picked it

It shows how the voyage, the tortoises and Malthus led Darwin to natural selection.

BBC News on YouTubechecked 2026-10-20

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