the were archbacteria they were the simplest bacteria and didn't use oxygen
The earliest ones still around are stromatolites, but there were lots of earlier life forms.
Cyanobacteria
cyanobacteria
The earliest forms of life were microscopic autotrophs that lived in the great prehistoric oceans. Living under the water protected them from the deadly UV rays from the sun, as at this point Earth had not developed a suitable atmosphere. This is true everywhere but Kansas, where the earliest life forms were Adam and Eve. Zing!
By creating the crust
Stromatolites are one of the earliest known life forms; some fossils may date back 3.5 billion years - before Earth had any oxygen in it's atmosphere.
Stromatolites are one of the earliest known life forms; some fossils may date back 3.5 billion years - before Earth had any oxygen in it's atmosphere.
The prevailing theory of the origin of life on earth posits that it began in the oceans.
Stromatolites are one of the earliest known life forms; some fossils may date back 3.5 billion years - before Earth had any oxygen in it's atmosphere.
The earliest life forms on Earth were single-celled microorganisms like bacteria and archaea. These simple organisms emerged around 3.5 to 4 billion years ago in the ancient oceans of the planet. They played a crucial role in shaping the environment and paving the way for more complex life forms to evolve.
I know you have a textbook so use it
The earliest life forms on Earth were likely single-celled microorganisms such as bacteria and archaea. These organisms appeared around 3.5 to 4 billion years ago in ancient oceans and are thought to be the ancestors of all life on Earth today.