The circulatory and respiratory system are connected at the lungs. The circulatory needs oxygen form the lungs to pump the blood around the body and the respiratory system supplies the oxygen and gets the oxygen from the air into your bloodstream.Sep 23, 2013
The answer is viruses change their form when the immune system knows how to kill it and thats how they trick the immune system and viruses are much smaller than bacterias
<span>This is true because late on the athletes from South Africa were kicked out of the competition. </span>
Answer:
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Explanation:
sorry to see u go! thank you for the points and i wish u the best on ur journey! <3
