We can see that there's air due to the fact that there was too much sustrat and microorganisms have produced CH4 .
In this column all is dark, it has anaerobic bacteriums.
Tube in light
We can see that in the surface, the tube has turned to light brown due to the presence of aerobic bacteriums.
When we compared both columns, we can see that only in the light column has appeared an extract light brown. Therefore, we deduce that the microorganisms that have grown there, are photosyntetic.
Darkness Light
Did you add the same amount of substrate? Why in the dark gases are produced in excess whereas in the light no?
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