Molecule
Molecules are smaller than cells and are the building blocks of cells.
The simplest level of organization as far as taxonomy goes would be the most inclusive one; a domain. If you are asking in terms of things such as organisms, it would be the smallest, the cell.
The lowest level of organization in living things is the cell. Cells are the basic unit of life and are responsible for carrying out all the functions necessary for an organism to survive.
In what is possibly the most extremely unsatisfying answer, we don't actually know. As microscopes get more and more powerful, we are discovering incredible amounts of structure at the sub-atomic level. Despite this, the common label for the smallest physical organization in ecology is simply "Organisms". At one point we thought that things couldn't get much smaller. Now we are finding vast factories with unprecedented order as we look closer at even single-celled organisms.
Protists are typically organized at the cellular level, as they are unicellular organisms. They can also form colonies or multicellular structures in some cases, but their primary level of structural organization is at the cellular level.
Molecules are smaller than cells and are the building blocks of cells.
The fourth level of cell organization is an organ system. The levels of organization are: Cell, Tissue, Organ, Organ system.
A cell.
The cell which is the basic unit of life
Cell level
The lowest level is the cell.
The Biosphere!!
cell is the smallest level of organization in a unicellular organism
cell
cell
"Cell" From unicellular to colonial and than filamentous forms
Answer tissue