Wich two system work together to deliver oxygen in cells throughout the body

The circulatory system and the Respiratory system work closely seamlessly with each other in order to supply the oxygen throughout the body and remove the carbon dioxide out from the body.

Explanation:

These two system work all day all year without stopping for even a single second. The respiratory system functions with the circulatory system to carry oxygen that we inhale to the blood cells and release carbon dioxide.

The heart pumps the oxygenated blood and the circulatory system carries the blood to every part of the human body.

Answer: The respiratory and circulatory system.