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.

Muscles in the body us with a lot of things for example, if i wanted to lift a heavy box and had no muscle i would just collapse where i was because of the fact muscles hold us together. overall they are 650 muscle in the human body, all of them have different purposes and ways to keep us together. there are three types of muscle in the body skeletal, smooth, and cardiac muscle. skeletal muscle are attached to the bone and with movement. smooth muscle, this is found in the wall of our organs, such as our stomach, this muscle with movement   as well, without this muscle, we would only be allowed to eat small amounts. the cardiac muscle is the heart muscle and probably the most important one. these are only found in the walls of the heart and the heart pump blood to the other parts of your body. we have two different types of muscle fibers, slow twitch and fast twitch. slow twitch muscles enable long-endurance feats such as distance running. fast twitch fatigue faster but are used in powerful bursts of movements like sprinting. there are three different types of muscle contractions concentric, eccentric, isometric. concentric contraction causes muscles to shorten, thereby generating force.   eccentric contractions cause muscles to elongate in response to a greater opposing force. isometric contractions generate force without changing the length of the muscle.: //athleticquickness.com/muscle-contraction-types-part-1/