58675
This would have proven to be a good environment for " Cyanobacteria " to evolve the first photosynthetic metabolic pathways which gradually increased the oxygen portion of the atmosphere , changing it to what is known as an oxidizing atmosphere .
 Cyanobacteria
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Cyanobacteria