Which list shows the correct order of living units, from smallest to largest?

The correct order of living units from smallest to largest  are: 1)  Molecule 2) Organelle  3) Cell  4) Tissue  5) Organism  6) Population.
A molecule is the smallest particle in a chemical element that has the chemical properties of that element or compound.
An organelle is a tiny cellular structure that performs specific functions within a cell. Meaning they are smaller than cells.
A cell contains the fundamental molecules of life and of which all living things are composed of.
Tissue is a group of cells found together in the body. 
Organisms are made up of organs, which are made up of tissues.  It is a living thing that can function on its own.
Population are groups of living things that live together in a particular area. They are capable of interbreeding.