Respuesta :
Answer:
Explanation:
About 21% of Earth's atmosphere is oxygen, and most of the rest is nitrogen. ... the evolution of Cyanobacteria, a group of single-celled, blue-green bacteria. ... Today, Cyanobacteria can be found almost everywhere on Earth — likely right ... the genetic machinery for photosynthesis that we'd expect to see if they had lost this ...
Answer:
Instead of oxygen, the atmosphere would be rich in sulfur.
Explanation: