1. The success of an organ transplant depends on many factors. What unavoidable factor would diminish the chance of success of a lung transplant, but is not a factor at all in a heart transplant?
2. At a construction site, a hole caved in and buried a workman up to his shoulders in wet sand. The foreman told the trapped man that a crane would be there in 20 minutes to pull him out, but another worker said they couldn't wait, and had to dig NOW. He was right. Why is this a life-threatening emergency?