The carton of milk in your refrigerator contains 20 cells per glass of a strain of e. coli which makes people sick. this strain doubles every 2 days, and your immune system can destroy up to 1000 cells per glass without noticeable effects. (a) when should the carton of milk be poured down the drain? (b) at room temperature this strain doubles every 8 h. for how long is the milk drinkable if left on the counter?