How did photosynthetic bacteria begin to change the Earth 3.5 million years ago?

Answer 1

The primordial atmosphere did not contain oxygen. The photosynthetic bacteria carried out photosynthesis and produced oxygen from water and fixed CO2 into carbohydrates. The presence of oxygen in the atmosphere enabled high forms of life to evolve.

Answer 2

3.5 million years ago, Earth's atmosphere was full of radiation and wasn't supportive of life. However, photosynthetic bacteria (i.e. cyanobacteria) would take the carbon dioxide in our atmosphere and produce oxygen. As this continued to happen, more oxygen built up in our atmosphere and the ozone layer was formed, protecting the Earth from radiation. This caused the Earth to be supportive of life, and over time more and more living forms evolved and survived in our atmosphere bringing us to where we are today.

Answer 3

It took about a billion years to just remove the iron from the ocean. Iron cannot remain soluble in water in the presence of O2. Then it converted the atmosphere to an oxidizing environment that was toxic to previous lifeforms. Some eventually evolved to metabolize compounds using oxygen.

Answer 4

The biggest difference is that the photosynthesis gave off oxygen gas and began to change the make-up of the atmosphere. There was no oxygen in the air, and this development added oxygen.

Answer 5

When Did Photosynthesis Begin

Answer 6

in the process of photosynthetic bacteria converted carbon dioxide into oxygen. It was their doing that created the oxygen rich atmosphere we have today.
I hope this helps. Good luck.

Answer 7

they began to allow free molecular oxygen to be present, before photosynthesis, there was no free molecular oxygen, and slowly this allowed plants to evolve and adapt to live on land.

Answer 8

it didn't god did