What do groups of organs collectively form?

Groups of organs collectively form systems. In biological and anatomical terms, a system is a higher level of organization that includes multiple organs that work together to perform complex functions necessary for life. For example, the digestive system includes the stomach, liver, intestines, and other organs that collaborate to process food and extract nutrients. This hierarchical organization is crucial for understanding how different parts of a living organism interact and maintain homeostasis.

Cells, tissues, and structures represent other levels of biological organization. Cells are the basic units of life; tissues are groups of similar cells working together; and structures can refer to any physical composition within an organism. However, it is the systems that specifically denote the collective functioning of various organs. Thus, the concept of "systems" encapsulates the collaborative effort of organs in performing complex physiological roles.