Answer: Prokaryotes
Let's start by explaining that cells are essential microscopic units that make up the living beings, capable of reproducing independently. In their structure they have a region called cytoplasm with an inner nucleus, which contains the genetic information of the cell.
Now, in the case of prokaryotic cells there is no defined nucleus, therefore it is said that it has no nucleus. This means that the cell's genetic material is simpler than the others and is dispersed in the cytoplasm (in the nucleoid).
Due to having a less complex genetic information, prokaryotes are considered the first living organisms that existed on the planet and are mostly bacteria.
In addition, among its main characteristics is that they can feed themselves using organic matter and sunlight by photosynthesis or inorganic matter (autotrophic feeding) and can also feed on other organisms (heterotrophic feeding).