Which of the following levels of organization in the human body is the most complex?

• A. Tissue level
• B. Cellular level
• C. Organ level
• D. Organismal level

Answer: (D)

Verified step by step guidance

1. Begin by understanding the hierarchy of structural organization in the human body, which includes: chemical level, cellular level, tissue level, organ level, organ system level, and organismal level.
2. Recognize that each level builds upon the previous one, increasing in complexity. For example, cells combine to form tissues, tissues combine to form organs, and organs work together in organ systems.
3. Consider the organismal level, which represents the entire living being. It encompasses all other levels, including multiple organ systems working together to sustain life.
4. Compare the complexity of the organismal level with the other levels mentioned: tissue, cellular, and organ levels. The organismal level integrates all these components into a functioning whole.
5. Conclude that the organismal level is the most complex because it includes all other levels and represents the complete living entity, capable of performing all necessary life processes.