Ancient cyanobacteria found in fossil arrangements called stromatolites were very important in the history of life because they produced oxygen in the atmosphere.
Stromatolites are one of the oldest known pieces of evidence of life on earth and are crucial in understanding the process of how life began and started to diversify itself. They performed photosynthesis by using the energy of the sun and as a result produced oxygen in the atmosphere.
Therefore, they played an essential role in shaping the atmosphere as we know and live in it today, causing an irreversible increase in atmospheric oxygen for organisms to survive.
To know more about Stromatolites refer to the link below
https://brainly.com/question/11166601
#SPJ4
