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No oxygen is liberated in purple sulphur bacteria during photosynthesis. this is because of they use:

options are
A) h2o as starting material
B)h2s as starting material
C)co2 as starting material
D)photosynthesis is a chemical process



B)they use h2s as starting material 
is the perfect answer
1 5 1
The correct answer is option B) H2S as starting material.
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