To make our column, we prepared a mixture of Rio San Pedro sediment, 0.20 grams of CaSO4 and pieces of filter paper. We put our mixture in two bottles until it reached two thirds of its height and then we added approximately one inch of water to each bottle.
Each bottle will be in slightly different conditions. Group 3B bottle will develop in a box, thus providing dark conditions for our microorganisms to grow in. On the other hand, group 7B will expose their bottle to sunlight. Then we will stablish a comparison between both bottles.
To be continued...
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