Answer:
Importance of cyanobacteria for our atmosphere is , it provide oxygen during the process of photosynthesis .
Step-by-step explanation:
Cyanobacteria is important as ,
It performs the process of photosynthesis , and releases oxygen in the atmosphere , it uses sunlight for the process of photosynthesis .
Cynobacteria have converted an early oxygen - deficient , reducing atmosphere to an oxidizing atmosphere , causing to the Great Oxygenation Event and Rusting of The Earth , that changed the composition of the Earth's life form and led to near - extinction of the anaerobic organisms .