RNA World is the first proposed step in transitioning from non‐living to living. Several hypotheses describe the assimilation of chemicals into an order that responds to the environment in a living sort of way. If we assume those ideas are correct, the next step is the world of the living.
As prokaryotes evolved, they exploited and changed young Earth:
The prokaryotes are a group of organisms that lack a cell nucleus(= karyon), or any other membrane–bound organelles. The organisms that have a cell nucleus are called eukaryotes. Prokaryotes are mostly bacteria, and their advancements led to more complex living organisms.
It has been suggested that the bacteria resulted from this evolution and as bacteria modified structures to expand their territory and tolerance, they changed into newer species of bacteria with diverse structures and functions. Due to their uniqueness, bacteria are classified in their own kingdom. Advancements in the structure and function of prokaryotes continued to the juncture where two separate types are now identifiable: bacteria and archaea.