Biology · KS3 Y9 · Ecosystems

Competition & interdependence

Competition & interdependenceFree2:21Heddy Score 3 of 7, below the standard
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What you need to know

  • Food, mates, light and shelter are limited in every ecosystem, so organisms compete for them.
  • Animals of the same species compete for food, shelter and mates, as when hermit crabs fight over a bigger shell.
  • Organisms can be in competition without fighting, simply by eating the same limited food.
  • Different species also compete, such as surgeonfish and parrotfish feeding on the same coral.
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

348K views · 1.22K likes · Stile Education 13.3K subscribers

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

Why we picked it

Striking marine footage makes competition for food, shelter and mates easy to picture, both within and between species.

Stile Education on YouTubechecked 2026-10-22

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