The correct sequence of levels forming structural hierarchy is
organ, organ system, cellular, chemical, tissue, organismal
chemical, cellular, tissue, organismal, organ, organ system
chemical, cellular, tissue, organ, organ system, organismal
organismal, organ system, organ, tissue, cellular, chemical
(c) Chemical, cellular, tissue, organ, organ system, organismal: In a human body, there are six main levels of structural organization.
The structural organization begins at the simplest level, that is, the chemical level. This level includes the simplest building blocks composed of matter such as atoms and molecules. This level is followed by the cellular level, which is made up of the cell. The cell is considered as the smallest, as well as the functional, unit of living organisms that can exist on its own. The cellular level is followed by the tissue, organ, organ system, and organismal level.