Good morning,
We prepare two Winogradsky columns. We take to prepare theses bottles:
-2 clear plastic bottles
-Sediment of mud.
-Water from the San Pedro's River
-Enrichment materials
The first day, both bottles seem to be the same. The purposes of preparing theses bottles are comparing the effects which show with the sunlight and the darkness.
More information in the next post.
What exactly was the enrichment material?
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