Final answer:
Body systems are interconnected, as they work in unison to maintain life and perform essential biological activities in an organism.
Step-by-step explanation:
Body systems are interconnected, referring to the fact that the systems must work together to support human life. This term completes the statement because at the organismal level, many organ systems such as the circulatory, respiratory, and digestive systems work harmoniously together to perform the functions necessary for the survival of an independent organism. Each organ system has a unique role, but they all contribute to vital biological activities like organization, metabolism, responsiveness, movement, development, and reproduction.
The organism level is the highest level of organization where all cells, tissues, organs, and organ systems of the body interact and coordinate to maintain life and health. Such integration is essential for the biological activities of the organism as a whole. Thus, body systems cannot be seen as isolated or independent; rather, they are interconnected and interdependent.