i need help.
What evidence shows that the Precambrian atmosphere did not contain oxygen?
It changed from a reducing atmosphere containing no free oxygen to an atmosphere containing oxygen. The evolution of life on Earth "terraformed" the planet.
The amount of oxygen increased greatly
The atmosphere, during the Precambrian became richer in oxygen caused by a bacteria called cyanobacteria.
oxygen
i need help.
precambrian era
The origin of free oxygen
What evidence shows that the Precambrian atmosphere did not contain oxygen?
It changed from a reducing atmosphere containing no free oxygen to an atmosphere containing oxygen. The evolution of life on Earth "terraformed" the planet.
The amount of oxygen increased greatly
The atmosphere, during the Precambrian became richer in oxygen caused by a bacteria called cyanobacteria.
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The Precambrian Time
The Precambrian time
it was on earth the precambrian era is an era that happend several million years ago on the earths surface