The correct sequence of levels forming the structural hierarchy is (a) organ, organ system, cellular, chemical, tissue, organismal; (b) chemical, cellular, tissue, organismal, organ, organ system; (c) chemical, cellular, tissue, organ, organ system, organismal; (d) organismal, organ system, organ, tissue, cellular, chemical.

Option (c).

Explanation:

The evolution of the complex organisms take several billion years. The evolution of the organisms starts from the basic level and then move to the complex forms.

The hierarchy determines the level of the organization. Cell is the basic level of organization. The cells are formed by the union of chemicals. The cell combine together to form tissue. Tissue combines together to form the organ then the organ system and finally the whole organisms.

Thus, the correct answer is option (c).

communicate with the patient and explain every step before proceeding to do so