What is the correct order of levels of organization in the human body?

The correct order of levels of organization in the human body starts with the most basic unit, which is the cell. Cells group together to form tissues, which are collections of similar cells working together for a common function. These tissues then combine to create organs, which perform specific functions necessary for survival. Several organs interact to form organ systems, which are groups of organs that work together to carry out complex processes. Lastly, all of these systems come together to form the complete organism.

This sequence illustrates a clear progression from simple to more complex structures, emphasizing that each level of organization builds upon the previous one. The other options do not represent the biological hierarchy accurately; for example, some begin with elements such as chemicals or atoms, which are too fundamental when discussing the organization relevant to biological systems. Understanding this hierarchy is crucial for grasping how different components of the human body work together to maintain homeostasis and overall health.