Answer:
The answer is Cell, Tissue, Organ, Organ System, Organism
Explanation:
The basic level of organization for living things starts in the cell. A cell is able to provide <u>specific life functions on its own</u>, including producing its own energy. An example is a <em>simple columnar epithelium</em>.
When cells come together, they form a tissue. A tissue is a <u>group of cells</u> that performs the <u>same functions</u>. An example would be <em>intestinal tissue</em>.
When combined with other tissues, this creates an organ. An organ may be <u>composed of different kinds of tissues and functions</u>, but overall, they act universally. The <em>small intestine</em> is an example.
An organ system is composed of <u>different organs</u> and is able to carry out <u>various functions and may be classified differently</u> with other organ systems. The <em>gastrointestinal system</em> as a whole is an example.