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The metallic lustre goes on due to expo...

The metallic lustre goes on ________ due to exposure to atmospheric oxygen.

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decreasing
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Assertion (A) : Cyanobacteria are photosynthetic blue green algae which produce oxygen. Reason (R) : Cyanobacteria played a key role in the changes of atmospheric oxygen levels from So anaerobic to acerobic during the geologic periods.