Answer:
Two systems that work very closely together are our cardiovascular and respiratory systems. The cardiovascular system includes your heart and blood vessels , which function to remove deoxygenated blood from and return oxygenated blood thoughout your body. The heart then sends the oxygenated blood out to the body .
A good example is pulmonary system and the circulatory system .
Explanation:
please mark me as brainliest.
