By 
Anusuya Willis
 | 
TED-Ed Original

How a single-celled organism almost wiped out life on Earth

There's an organism that changed the world. It caused the first mass extinction in Earth's history … and also paved the way for complex life. How? Anusuya Willis explains how cyanobacteria simple organisms that don't even have nuclei or any other organelles wrote a pivotal chapter in the story of life on Earth.

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