If it's organized enough to be considered a cell it probably isn't simple. If you mean streamlined or does the work of a cell without all of the extra parts, then I would say the domain Archea or primitive prokaryotic (bacterial) cells that live in extreme conditions.
The Monera kingdom.
The cell is the basic unit of structure of an organism.
Cell structure
It is CELL
is a cell
Red blood cell
cell
Many people might think the answer to this question would be an atom, but not in life. The structures go like this from largest to smallest: Ecosystem, Community, Organism, Organ system, Organ, Tissue, Cell.
The cell is the basic unit of structure of an organism.
* Kingdom Animalia, Phylum prokaryotae. i disagree, its kingdon prokaryote
The fundamental unit of an organism is the cell.
Cell structure
cell
The cell nucleus is the structure that contains most of an organism's DNA.
No they do not
The cell is the basic unit of structure and organization of organisms. Although organisms such as humans, dogs, and trees can become very large and complex, the cell remains the simplest, most basic component of any organism.
Amoeba, protozoans have the simplest cell structure as thery are predominantly unicellular organisms
It is CELL