Question

how are the circulatory and respiratory systems connected to maintain homeostasis in the body?
the circulatory system takes in oxygen and the respiratory system delivers it to the body.
the lungs take in oxygen and the blood delivers it to the rest of the body.
the lungs take in carbon dioxide and the blood takes it to the rest of the body.

Explanation:

The respiratory system, specifically the lungs, is responsible for gas - exchange, taking in oxygen. The circulatory system, with blood as the medium, transports this oxygen to the rest of the body's cells. Also, the lungs expel carbon dioxide, not take it in.

Answer:

The lungs take in oxygen and the blood delivers it to the rest of the body.