Biology · GCSE · Evolution & Inheritance

Fossils & the evidence

Fossils & the evidenceFree10:32Heddy Score 3 of 7, below the standard

What you need to know

  • Whales share mammal features such as warm blood, lungs and finger bones inside the flipper.
  • A whale embryo briefly has hind-limb buds, and its nostrils start nearer the tip of the snout.
  • Fossils of earlier whale-like animals still have legs, linking them to four-legged land mammals.
  • DNA groups whales with hippos, which fits that land ancestry.

In this clip

Runs 10:32, from 0:00 to 10:32 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

6.62M views · 96K likes · Stated Clearly 607K subscribers

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

Why we picked it

It uses whale fossils, embryos and DNA as one clear trail of evidence for evolution.

Stated Clearly on YouTubechecked 2026-10-20

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