How did life begin on the planet earth?
Perhaps, life came as single cell bacteria that need no oxygen or water, to live for even thousands of years. Read more in the explanation.
The sequential order in evolution is believed to be nonliving-living-
modern man (homo-sapiens).
The belief called panspermatism (panspermia) is a philosophy that
life came from extraterrestrial origin, transported by the same
whacking object impinging on Mars, and then Earth, billions of years
ago, in its shrunk solar orbit, causing giant crater on Mars, a smaller
crater on the Earth (now a Bay), and and then settled as Moon,
orbiting the Earth.
This means that the Earth only has had various parameters that
helped the process of evolution, from single-cell bacteria to