What systems rely on the digestive system?
I think it's the circulation system that relies on the digestive system because the blood needs to transport the nutrients which is from the digestive system
There are nine major body systems that depend on each other. These systems work in unison to ensure that the body as a whole is healthy and functions properly. These systems include the Skeletal system, muscular system, blood, cardiovascular, central nervous, endocrine, digestive, respiratory, and integumentary.
All systems in the human body directly or indirectly depend on each other. However, the digestive system mainly relies on the circulatory system and the musculatory system. The circulatory system brings enzymes and oxygen to the digestive system. The musculatory system performs peristalsis, to move the food through the digestive system.