God created it along with everything else in the universe.
The scientific would be that they developed from single-celled organisms; some scientists even believe that some bacteria may have arrived from space. No one really knows for sure, though simple life has been created in the laboratory by the introduction of electricity (such as a lightning bolt might provide) to a chemical "stew" similar to what is presumed to have existed early in this planet's history.
Sound science does not necessarily preclude the existence of a "Creator", but we can be absolutely sure that Genesis, and other creation stories, are nothing more than attempts by early humans to explain existence, and are not factual blow-by-blow accounts.
First of all, earth got hit by a mars sized rock called thiea. This gave us the moon which changed our atmosphere. Besides, the earth didn't have an atmosphere before thiea hit it.
Single cell organisms date back to approximately 3.5-3.8 billion years old. These are bacteria and archaea.
Cyanobacteria or blue-algae are microbes that produce oxygen through the process of photosynthesis. Some scientists believe that these bacteria were the first to produce oxygen on Earth.
There is more bacteria than other forms of life.
Bacterial growth is constrained by several parameters such as the level of nutrients around them, the temperature they grow at, pH and whether they grow in air or not just to name a few. No single bacteria can grow in all conditions so therefore bacteria can never engulf the earth. Most bacteria have fairly specific growth conditions.
bacteria
bacteria
Bacteria were the first living things on the planet Earth.
BACTERIA
Bacteria.
Bacteria
bacteria
Bacteria.
Archaea and Bacteria
the first type of cells on the early earth were prokaryote cells.
a bacteria
bacteria is not right it is prokaryotes