Which of the following best describes the relationship among the units from cell to organism?

The correct response illustrates the organization of biological structures, depicting a hierarchical relationship starting from the simplest level—cells—up to the most complex, which is the organism. Cells are the fundamental building blocks of life, functioning independently to perform various tasks. When similar cells group together, they form tissues, which specialize in particular functions. These tissues then combine to create organs, such as the heart or lungs, each serving a distinct purpose within an organism.

The organs further collaborate with other organs to establish organ systems, like the digestive or circulatory systems, working in concert to maintain the life and health of the organism as a whole. This progression from cells to tissues, then to organs, followed by organ systems, and culminating in the complete organism emphasizes how multiple levels of complexity coalesce to sustain life.

Understanding this hierarchy is vital in biology, as it lays the foundation for studying various life processes, how different biological systems interact, and how disruptions at any level can affect overall organism health.