I think currently the smallest living organisms are thought to be "viroids", which are smaller than viruses. Scientists are still figuring out exactly what viroids are, and do, but they are able to replicate, which means they are life.
It does not have a nucleus
sex
This question is vague therefore I have provided two answers and explanations. The single cell is the smallest living unit within a living system. Quarks are the smallest particles of matter and atoms which composes all living things.
cell in every livivng organism
A cell. Cells are the basic unit of life. Unicellular organisms can perform life tasks on its own, and they are one cell. Multicellular organisims have more than one cell (you and I), and can also perform life tasks.
an organism is any type of living thing.
Non living factors that affect organism survival are called abiotic factors. Living factors that affect organism survival are called biotic factors.
a cell
a cell
a cell
The cell is the smallest living thing and an atom is the smallest non-living thing.
cell
The cell.
a cell. it is the basic component off all matters.
The microorganism is SAR11, the smallest free living cell known and probably the most abundant organism in the seas
No, a cell is the smallest part of a living organism that can be considered alive.
The smallest living organism is Nanoarchaeum equitans. This minuscule microbe was only just discovered in a hydrothermal vent off the coast of Iceland and its cells are only 400 nanometers across.
Going from smallest to largest: molecule, organelle, cell, tissue, organ, organ system, organism
Difficult question. Viruses can be considered non-living because they lack a cellular structure and cannot metabolize things on their own. Porcine cicovirus is the smallest virus. Nanobes are considered the smallest known organism by most. But there are also Nanoarchaeum and Mycoplasma Gentilalium.