A noncommunicatable disease is a disease that cannot be transmitted. so hypertension
C. A 50% oxygen saturation level of blood returning to the lungs might indicate an activity level higher than normal.
It is a good idea because it helps to detect if there is too much carbon monoxide in the house. If there is too much, it can be poisonous and the detector will let you know. this answer would be TO AVOID POISONING BY A BUILDUP OF CO GAS.
btw, is this platoweb? just curious.
