Biology · KS3 Y9 · Evolution & Inheritance

Natural selection

Natural selectionFree3:14Heddy Score 3 of 7, below the standard
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What you need to know

  • Individuals in a species vary, and they pass their DNA to their offspring.
  • In a habitat where dark frogs are harder to see, those frogs survive and leave more offspring.
  • Over many generations the helpful trait becomes more common in the population.
  • A difference only spreads if it changes survival or the number of offspring.

In this clip

Runs 3:14, from 0:55 to 4:09 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

4.64M views · 25.4K likes · Amoeba Sisters 2.98M subscribers

As reported by YouTube on 2026-11-02. Not part of the Heddy Score.
How the Heddy Score works

Why we picked it

The frog example teaches selection, then the same idea is applied to antibiotic resistance in its own section.

Amoeba Sisters on YouTubechecked 2026-10-20

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