Well... to create enough oxygen to cover the planet would require large forests or water and algae. There might be enough CO2 for plants to thrive and create oxygen, but then you have to consider the ambient temperature on Mars,which can be 70F on some days but -200F on other days. I'm not sure plants could survive in those conditions.
Terraforming on the scale of Mars is a daunting task.
Well... to create enough oxygen to cover the planet would require large forests or water and algae. There might be enough CO2 for plants to thrive and create oxygen, but then you have to consider the ambient temperature on Mars,which can be 70F on some days but -200F on other days. I'm not sure plants could survive in those conditions.
Terraforming on the scale of Mars is a daunting task.
It will happen.