Final answer:
The levels of organization in the human body increase in complexity from the chemical level to the organism level. This organization begins with atoms and molecules, progresses to cells and tissues, then to organs and organ systems, and culminates in the whole organism.
Step-by-step explanation:
The order of the levels of organization in the human body from the least complex to the most complex is as follows:
- Chemical level - includes subatomic particles, atoms, and molecules.
- Cellular level - consists of cells, the basic units of life.
- Tissue level - groups of similar cells performing common functions.
- Organ level - composed of two or more types of tissues working together to perform specific tasks.
- Organ system level - involves different organs that work closely together to accomplish a common purpose.
- Organism level - an individual living being that has sustained functioning organ systems.
At each level, there is a greater degree of complexity than the preceding level as structures are built from smaller units.