This semester I am not teaching environmental science, but for display purposes I have been setting up a few experiments. One which got a lot of attention at the booth I rented at the Pennsylvania Science Teacher Association conference last week was the algae culture I produced by applying different doses of carbon dioxide. Below are the I got after 3 and 8 weeks. The bottles in each picture are placed in order of decreasing doses of carbon dioxide (the last bottle on the right is the control...
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