What does the term 'cellular organization' refer to?

The term 'cellular organization' refers to the structural arrangement of biological materials, which encompasses the different levels of organization within living organisms, from individual cells to complex systems. This concept highlights how cells are the basic units of life that combine to form tissues, organs, and ultimately, organ systems that work together to support the overall function of an organism.

In this context, the idea of cellular organization illustrates the importance of understanding how cells are structured and how they interact cohesively to maintain life processes. This structural hierarchy allows for specialization, where different types of cells have distinct roles that contribute to the overall functioning of tissues and systems.

While other options touch upon different aspects of biology, such as grouping of cells, hierarchy of functions, and replication processes, they do not fully encapsulate the broad concept of organizational structure from the cellular level upwards as the correct choice does.