See the full lesson: http://ed.ted.com/lessons/why-is-biodiversity-so-important-kim-preshoff

Our planet's diverse and thriving ecosystems may seem permanent, but they are actually vulnerable to collapse. Jungles can become deserts and reefs can become lifeless rocks. What makes one ecosystem strong and another weak in the face of change? Kim Preshoff explains why the answer, to a large extent, lies in biodiversity.

Lesson by Kim Preshoff, animation by TED-Ed.

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