the circlatory system
because it does
Movement
The respiratory system helps you to breathe and if you couldn't breathe correctly your immune system would go down. That is how these system rely on each other.
the digestive system and the respiratory system, or the lymphatic system and the endocrine system, or the digestive system and the cardiovascular system, or the endocrine system and the cardiovascular system
Nothing
lymphatic
Tcp/Ip
Nothing permanently cleans out your system, so the answer would be no.
The Greeks in Athens never had to rely on a system of representative government because their population was so small they could all easily participate.
Windows 7 is an operating system. It does not rely on any other operating system to function.
Nothing