What role did cyanobacteria play in the cambrian explosion? quizet?

Cyanobacteria play in the Cambrian explosion is that they produce oxygen as a waste product of photosynthesis, which caused in the regular rise of oxygen in the Archaean and Proterozoic Eons - - this spelled doom for many anaerobic species, but enabled the formation of new bacterial and archaeal species that used aerobic respiration - - in addition, aerobic respiration is likely to have played a key role in the emergence and eventual explosion of eukaryotic life-forms, which naturally have high-energy demands.