Final answer:
The correct order of the levels of organization from smallest to largest in a complex, multicellular organism is: cell, tissue, organ, organ system, and organism, corresponding to option (c).
Step-by-step explanation:
To determine the correct order of the levels of organization in a complex multicellular organism, we begin at the smallest unit of life, the cell, and work our way up to the largest, the whole organism. Cells combine to form tissues, tissues come together to create organs, organs work in unison as part of organ systems, and all organ systems function together to make up an organism. Therefore, the correct order from smallest to largest is: cell → tissue → organ → organ system → organism, which corresponds to choice (c) in the options provided.
Biology examines the structure of living organisms in terms of various levels of organization. The process of delineating these levels helps to understand the complexity and functionality of organisms, including understanding how cells work together to support life's processes in bodies.