Final answer:
The correct sequence from the most complex to the simplest level of biological organization is organism, system, organ, tissue, cellular, molecular.
Step-by-step explanation:
The correct order from the most complex to the simplest in terms of biological organization is: organism, system, organ, tissue, cellular, molecular. Organisms are individual living entities made up of various organ systems. Each organ system is composed of different organs, which in turn consist of tissues.
Tissues are made up of cells, and those cells are built from molecules which are composed of atoms. Therefore, the sequence that properly represents this hierarchy from the most complex to the simplest is E) organism, system, organ, tissue, cellular, molecular.