Answer:
Bacteria
Step-by-step explanation:
Bacteria are unicellular microorganisms, in other words, they have a single cell, with the genetic material spread by the cytoplasm.
In addition, bacteria have no nuclear envelope or specialized organelles, these are characteristics of prokaryotes.
There are autotrophic bacteria, capable of synthesizing their own food, while heterotrophic bacteria (parasitic bacteria) get food from living things, causing disease to them.
In addition, bacteria have a protection on the outside of the plasma membrane called cell wall (usually composed of amino acid-bound sugars).
Note: Bacteria were formerly part of the monera kingdom, however, the term "monera" is not currently used (except for some books) and the kingdom has been divided into Bacteria and Archaea.