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Life Before Oxygen

Grades: 3-12
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Three billion years ago single-celled underwater bacteria used sunlight to convert carbon dioxide and water into tiny oxygen bubbles. Soon plants were turning an ...

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Accessibility: Auditory, Visual, Caption

Permitted use: Stream Only

© 1994, 2002 WGBH Educational Foundation. All rights reserved.

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Benchmarks for Science Literacy
NSTA National Science Education Standards


Source:

Interactive NOVA: "Earth"

Credits

Adapted from Interactive NOVA: "Earth."  Third party materials courtesy of Wolfgang Bayer and NHK.


Project Credits

Contributor: WGBH Educational Foundation


Funder: National Science Foundation


Producer: WGBH Educational Foundation