What structure divides the thoracic and abdominal cavities?

What condition is most likely present when a normal p wave is negatively deflected?

For which locations does the occupational safety and health administration (osha) enforce safety? kitchens in private homes ,backyard farms ,community malls, personal art studios

Why would a smoker tend to inhale more deeply and smoke more cigarettes when he or she switches to low nicotine cigarettes