I believe the correct answer is B because you obviously need to see if the person is still alive or not. I'm having second thoughts that it might be A.. I'm not sure which. Hopefully you get it right
The start of menstruation
Food certainly foods they eat
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